Upgrade Node.js base image from ubi9/nodejs-20 to ubi9/nodejs-22

[crackcodecamp]

Summary

• ubi9/nodejs-20 has been deprecated, causing deprecated-base-image-check failures in Konflux/conforma builds for odh-dashboard and odh-mod-arch-model-registry components.
• Migrates all Dockerfiles, CI workflows, engine constraints, and docs from Node.js 20 to Node.js 22.

Changes

• Dockerfiles: Dockerfile, packages/gen-ai/Dockerfile.openshift, packages/gen-ai/Dockerfile.workspace, packages/model-registry/Dockerfile.workspace, packages/plugin-template/Dockerfile.workspace, scripts/ci/Dockerfile
• CI Workflows: test.yml, modular-arch-quality-gates.yml, gen-ai-frontend-build.yml
• package.json engines: root, backend/, frontend/, packages/model-registry/upstream/frontend/
• package-lock.json: Updated project engine entries (third-party deps unchanged)
• Docs: docs/workspace-dockerfiles.md

Jira

https://redhat.atlassian.net/browse/RHOAIENG-64644

Test plan

• npm ci — passed with Node 22
• npm run build — webpack compiled successfully
• Unit tests — 251 suites, 2177 tests all passed
• CI pipeline validation after merge

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[bobbravo2]

/retest

[dpanshug]

/lgtm
The code changes looks good to me, without any breaking changes. Testing on cluster will require to merge this

[manaswinidas]

/retest

[dpanshug]

/retest

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.96%. Comparing base (00447fc) to head (8d4ea5a).

Additional details and impacted files

@@              Coverage Diff               @@
##           stable-2.x    #7670      +/-   ##
==============================================
+ Coverage       67.91%   67.96%   +0.04%     
==============================================
  Files            2238     2238              
  Lines           50822    50822              
  Branches        14243    14243              
==============================================
+ Hits            34516    34539      +23     
+ Misses          16306    16283      -23     

see 7 files with indirect coverage changes

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[lucferbux]

/lgtm
/approve

based on the slack conversation, due to missing gaps in our e2e test we are gonna approve to trigger odh builds, if anything is wrong let's rollback

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lucferbux

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