chore: Update the codeowners file to meet UI governance standards

[jjaquish]

Description

Update to the codeowners as per ui governance standards and the repo assignment spreadsheet. Done in bulk with Claude assistance so worth a close inspection.

RHCLOUD-50188

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Screenshots

Before:

After:

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Checklist ☑️

• PR only fixes one issue or story
• Change reviewed for extraneous code
• UI best practices adhered to
• Commits squashed and meaningfully named
• All PR checks pass locally (build, lint, test, E2E)

• (Optional) QE: Needs QE attention (OUIA changed, perceived impact to tests, no test coverage)
• (Optional) QE: Has been mentioned
• (Optional) UX: Needs UX attention (end user UX modified, missing designs)
• (Optional) UX: Has been mentioned

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 0f0f44db-057f-4ad6-8c63-ccc1173a814c

📥 Commits

Reviewing files that changed from the base of the PR and between a96a373 and 2b339a9.

📒 Files selected for processing (2)

• .github/CODEOWNERS
• build-tools

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Summary by CodeRabbit

• Chores
  • Improved repository ownership coverage for structural, configuration, and end-to-end testing files.
  • Updated build tooling to incorporate the latest maintenance improvements.
  • Clarified default ownership rules to support more consistent project maintenance and review routing.

Walkthrough

The pull request updates repository ownership rules and advances the build-tools submodule reference.

Changes

Repository ownership rules

Layer / File(s)	Summary
CODEOWNERS ownership coverage .github/CODEOWNERS	Defines default ownership and explicit ownership for structural, configuration, and Playwright E2E paths.

Build tooling reference

Layer / File(s)	Summary
Build-tools revision update build-tools	Updates the submodule reference to commit 39d36ebb4f98e9451e540d453dd41863b5d168af.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: aferd

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the primary change: updating CODEOWNERS to meet UI governance standards.
Description check	✅ Passed	The description summarizes the CODEOWNERS update, links the tracked issue, and includes the required screenshots and checklist sections.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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