feat(DX-7531): migrate contentstack-cli-tsgen v1 into cli-plugins monorepo

[cs-raj]

Summary

• Migrates contentstack-cli-tsgen from the standalone Contentstack-Solutions/contentstack-cli-tsgen repo into the cli-plugins monorepo under packages/contentstack-cli-tsgen, targeting the CLI 1.x line (first release: 4.10.0)
• Adds the full plugin source: src/commands/tsgen.ts, src/lib/helper.ts, src/types/index.ts, Jest integration test suite, ESLint config, tsconfig, and bin scripts
• Wires the package into monorepo CI: unit-test workflow, a new dedicated integration-test workflow (tsgen-integration-test.yml), and the production NPM release workflow
• Registers tsgen in release.json and updates the monorepo README to point to the new canonical source location
• Updates .talismanrc checksum for the new pnpm-lock.yaml

Test plan

• pnpm --filter contentstack-cli-tsgen run build completes without errors
• pnpm --filter contentstack-cli-tsgen run test (unit) passes
• Integration test workflow runs successfully with stack secrets (TOKEN_ALIAS, APIKEY, DELIVERYKEY, ENVIRONMENT, REGION)
• csdx plugins:link inside packages/contentstack-cli-tsgen and csdx tsgen -a <alias> -o generated.d.ts generates a valid .d.ts file
• Existing plugin packages are unaffected (no regression in unit-test workflow for other packages)

[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	1	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

ℹ️ Vulnerabilities Without Available Fixes (Informational Only)

The following vulnerabilities were detected but do not have fixes available (no upgrade or patch). These are excluded from failure thresholds:

• Critical without fixes: 0
• High without fixes: 0
• Medium without fixes: 1
• Low without fixes: 0

✅ 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	1	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

ℹ️ Vulnerabilities Without Available Fixes (Informational Only)

The following vulnerabilities were detected but do not have fixes available (no upgrade or patch). These are excluded from failure thresholds:

• Critical without fixes: 0
• High without fixes: 0
• Medium without fixes: 1
• Low without fixes: 0

✅ BUILD PASSED - All security checks passed