fix: restrict external DevWorkspaceOperatorConfig references to allowed namespaces

[rohanKanojia]

What does this PR do?

Limits controller.devfile.io/devworkspace-config so a DevWorkspace can only reference a DevWorkspaceOperatorConfig in its own namespace or the operator namespace.

Workspace-local DWOCs still merge operational settings (for example imagePullPolicy and PVC name). Pod-level fields such as security context, service account, runtime class, default template, pod annotations, and scheduler name are applied only when the referenced DWOC is in the operator namespace.

What issues does this PR fix or reference?

N/A

Is it tested? How?

TODO: Will share a test plan soon

PR Checklist

• E2E tests pass (when PR is ready, comment /test v8-devworkspace-operator-e2e, v8-che-happy-path to trigger)
  • v8-devworkspace-operator-e2e: DevWorkspace e2e test
  • v8-che-happy-path: Happy path for verification integration with Che

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: rohanKanojia
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[codecov]

Codecov Report

❌ Patch coverage is 78.04878% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.56%. Comparing base (5684f19) to head (33d485e).

Files with missing lines	Patch %	Lines
pkg/config/sync.go	78.04%	6 Missing and 3 partials ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #1696 +/- ##
==========================================
+ Coverage 40.46% 40.56% +0.09% 
==========================================
Files 172 172 Lines 15634 15674 +40 ==========================================
+ Hits 6327 6358 +31 - Misses 8920 8926 +6 - Partials 387 390 +3 

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