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

[desrosj]

Part of #82782.

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 #82744, which allows the workflow to run in wp/X.Y branches.
• Removed type key, which is unsupported for inputs (see Upgrade actionlint and run linting when composite actions are modified #76503).

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.

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[Copilot]

🟡 Changes recommended

The pull-request filter does not match the referenced #82744 behavior and can skip linting for other base branches.

Get a fresh assessment by requesting another Copilot review.

Pull request overview

Centralizes workflow linting on trunk and enables it for release branches.

Changes:

• Expands push and pull-request branch filters.
• Uses trunk’s reusable lint workflow.
• Removes the local reusable workflow.

File summaries

File	Description
.github/workflows/workflow-lint.yml	Updates triggers and reusable workflow reference.
.github/workflows/reusable-workflow-lint.yml	Removes the duplicated local workflow.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Balanced

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[Copilot]

🟡 Changes recommended

The newly referenced actionlint job currently fails on three existing files in this branch.

Get a fresh assessment by requesting another Copilot review.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Balanced

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

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