sync(workbenches): mirror workbenchNamespace into DSC status

[harshad16]

Description

Project workbenchNamespace onto status.components.workbenches via an optional workbenches-only writer, so the dashboard can resolve the legacy notebooks namespace without changing the generic release/managementState mirroring from #3838.

Sync PR related-to: opendatahub-io#3890

Created via:

git checkout rhoai-3.5
git checkout -b sync-status-workbenchNamespace
git cherry-pick 573ae314b26378e16b4e56ab94d5fed3df5d8c51
git push

JIRA: https://redhat.atlassian.net/browse/RHOAIENG-79812

How Has This Been Tested?

Defined in: opendatahub-io#3890

Screenshot or short clip

Merge criteria

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• Pull Request contains a description of the solution, a link to the JIRA issue, and to any dependent or related Pull Request.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work
• The developer has run the integration test pipeline and verified that it passed successfully
• New RELATED_IMAGE mappings are listed in ODH-Build-Config and RHOAI-Build-Config (CI validates names against build-config repos). Include links to build-config PRs in the description.

E2E test suite update requirement

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E2E update requirement opt-out justification

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 60.00000% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.78%. Comparing base (f3a5510) to head (8fe24ba).
⚠️ Report is 70 commits behind head on rhoai-3.5.

Files with missing lines	Patch %	Lines
...l/controller/modules/modules_controller_actions.go	33.33%	6 Missing and 2 partials ⚠️
internal/controller/modules/workbenches/handler.go	77.77%	2 Missing and 2 partials ⚠️
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Additional details and impacted files

@@              Coverage Diff              @@
##           rhoai-3.5   #37087      +/-   ##
=============================================
- Coverage      60.01%   59.78%   -0.23%     
=============================================
  Files            219      217       -2     
  Lines          17408    17175     -233     
=============================================
- Hits           10447    10268     -179     
+ Misses          6021     5980      -41     
+ Partials         940      927      -13     

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