Repair wp/7.0 branch Actions: Reference trunk's reusable workflow-lint job

[desrosj]

What?

• Removes the local .github/workflows/reusable-workflow-lint.yml and points workflow-lint.yml at WordPress/gutenberg/.github/workflows/reusable-workflow-lint.yml@trunk instead.
• Updates the branch filtering rules to match those added in Workflows: Refine and complete the push and pull_request branch filters WordPress/gutenberg#82744, which allows the workflow to run in wp/X.Y branches.

Why?

Linting workflow files helps prevent incorrect and/or insecure patterns from being introduced into the codebase.

Use of AI Tools

This PR was created by Claude Code under my supervision. All code should be treated as AI-produced and not yet reviewed by a human until this PR is marked Ready for Review.

[github-actions]

Flaky tests detected in 65b0018.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/desrosj/gutenberg/actions/runs/34549551369
📝 Reported tests:

Save flow should work as expected in /test/e2e/specs/editor/various/multi-entity-saving.spec.js, passed after 1 failed attempt.

Error: expect(locator).toBeDisabled() failed

Locator: getByRole('region', { name: 'Editor top bar' }).getByRole('button', { name: 'Saved' })
Expected: disabled
Timeout: 5000ms
Error: element(s) not found

Call log:
  - Expect "toBeDisabled" with timeout 5000ms
  - waiting for getByRole('region', { name: 'Editor top bar' }).getByRole('button', { name: 'Saved' })

    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/various/multi-entity-saving.spec.js:127:5

post title and content are editable and blocks can be inserted in /test/e2e/specs/editor/various/post-content-focus-mode.spec.js, passed after 1 failed attempt.

TimeoutError: locator.getAttribute: Timeout 10000ms exceeded.
Call log:
  - waiting for locator('[name="editor-canvas"]').contentFrame().getByText('Initial content')

    at Editor.selectBlocks (/home/runner/work/gutenberg/gutenberg/packages/e2e-test-utils-playwright/src/editor/select-blocks.ts:26:41)
    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/various/post-content-focus-mode.spec.js:163:18
    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/various/post-content-focus-mode.spec.js:159:15

should move focus back to the Publish panel toggle button when canceling in /test/e2e/specs/editor/various/publish-panel.spec.js, passed after 1 failed attempt.

Error: expect(locator).toBeFocused() failed

Locator:  locator('role=region[name="Editor top bar"i]').locator('role=button[name="Publish"i]')
Expected: focused
Received: inactive
Timeout:  5000ms

Call log:
  - Expect "toBeFocused" with timeout 5000ms
  - waiting for locator('role=region[name="Editor top bar"i]').locator('role=button[name="Publish"i]')
    9 × locator resolved to <button type="button" aria-expanded="true" aria-disabled="false" class="components-button editor-post-publish-panel__toggle editor-post-publish-button__button is-primary is-compact">Publish</button>
      - unexpected value "inactive"

    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/various/publish-panel.spec.js:33:44

[github-actions]

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Co-authored-by: desrosj <desrosj@git.wordpress.org>

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[desrosj]

Migrated to real upstream: WordPress#82799. Closing this fork PR.