feat: entry variants branch support

[reeshika-h]

• implementation

[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	0	0	25	✅ Passed
🟡 Medium Severity	0	0	500	✅ Passed
🔵 Low Severity	0	0	1000	✅ Passed

⏱️ SLA Breach Summary

✅ No SLA breaches detected. All vulnerabilities are within acceptable time thresholds.

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	0	30 / 120 days	✅ Passed
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

✅ BUILD PASSED - All security checks passed

[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	0	0	25	✅ Passed
🟡 Medium Severity	0	0	500	✅ Passed
🔵 Low Severity	0	0	1000	✅ Passed

⏱️ SLA Breach Summary

✅ No SLA breaches detected. All vulnerabilities are within acceptable time thresholds.

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	0	30 / 120 days	✅ Passed
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

✅ BUILD PASSED - All security checks passed

[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	0	0	25	✅ Passed
🟡 Medium Severity	0	0	500	✅ Passed
🔵 Low Severity	0	0	1000	✅ Passed

⏱️ SLA Breach Summary

✅ No SLA breaches detected. All vulnerabilities are within acceptable time thresholds.

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	0	30 / 120 days	✅ Passed
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

✅ BUILD PASSED - All security checks passed

[sunil-lakshman]

Add version bump and changelog

[Copilot]

Pull request overview

This PR adds Content Management API “entry variants” support to the Java SDK, including stack-branch header propagation/overrides and publish/unpublish flows that require an api_version header, plus request-shape unit tests and fixtures.

Changes:

• Added entry-variant endpoints to EntryService and corresponding public APIs on Entry (fetch/create/update/delete + publish/unpublish variants + branch handling helpers).
• Introduced new unit tests and JSON fixtures to validate request paths, query params, and headers (including branch and api_version).
• Extended shared constants/error messages to support variant-specific headers and validation.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/main/java/com/contentstack/cms/stack/EntryService.java	Adds Retrofit endpoints for entry-variant CRUD and adds query support to publish/unpublish.
src/main/java/com/contentstack/cms/stack/Entry.java	Adds branch/variant UID helpers and entry-variant operations, plus variant publish/unpublish helpers.
src/main/java/com/contentstack/cms/core/Util.java	Adds header constants for variant personalization and entry-variant publish API versioning.
src/main/java/com/contentstack/cms/core/ErrorMessages.java	Adds a validation message for missing Variant UID.
src/main/java/com/contentstack/cms/Contentstack.java	Updates stack(branch) Javadoc to clarify branch header behavior and overriding.
src/test/java/com/contentstack/cms/stack/EntryVariantUnitTest.java	New request-shape unit tests covering entry-variant endpoints and branch precedence.
src/test/java/com/contentstack/cms/stack/EntryVariantAPITest.java	New request-shape API test suite for entry-variant operations using fixtures and branch defaults.
src/test/java/com/contentstack/cms/stack/APISanityTestSuite.java	Registers the new entry-variant API tests in the sanity suite.
src/test/java/com/contentstack/cms/UnitTestSuite.java	Registers the new entry-variant unit tests in the unit suite.
src/test/java/com/contentstack/cms/TestClient.java	Adds env-configurable defaults for entry-variant test content type/branch/locale.
src/test/resources/entry_variant/create_entry_variant.json	Adds fixture payload for create variant requests.
src/test/resources/entry_variant/update_entry_variant.json	Adds fixture payload for update variant requests.
src/test/resources/entry_variant/publish_entry_variant.json	Adds fixture payload for publishing variants (requires api_version header).
src/test/resources/entry_variant/unpublish_entry_variant.json	Adds fixture payload for unpublishing variants (requires api_version header).
pom.xml	Changes surefire skipTests configuration.

---

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[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	0	0	25	✅ Passed
🟡 Medium Severity	0	0	500	✅ Passed
🔵 Low Severity	0	0	1000	✅ Passed

⏱️ SLA Breach Summary

✅ No SLA breaches detected. All vulnerabilities are within acceptable time thresholds.

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	0	30 / 120 days	✅ Passed
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

✅ BUILD PASSED - All security checks passed

[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	0	0	25	✅ Passed
🟡 Medium Severity	0	0	500	✅ Passed
🔵 Low Severity	0	0	1000	✅ Passed

⏱️ SLA Breach Summary

✅ No SLA breaches detected. All vulnerabilities are within acceptable time thresholds.

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	0	30 / 120 days	✅ Passed
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

✅ BUILD PASSED - All security checks passed