[ci] Update PR validation workflow

[nemesifier]

Checklist

• I have read the OpenWISP Contributing Guidelines and OpenWISP Anti AI Spam Policy.
• N/A. This GitHub Actions caller-workflow change has no local manual execution path.
• N/A. No application code changed.
• N/A. No user-facing behavior or documentation changed.

Reference to Existing Issue

Related to openwisp/openwisp-utils#716

Description of Changes

Adds edited and ready_for_review pull request events so the shared workflow promptly revalidates changed descriptions. Makes the concurrency key PR-specific so newer events cancel outdated validation runs.

Screenshot

N/A. This is a GitHub Actions workflow-only change.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: cda22762-65a6-456b-971a-d3313405a0a2

📥 Commits

Reviewing files that changed from the base of the PR and between e079d31 and 4a3c579.

📒 Files selected for processing (1)

• .github/workflows/bot-autoassign-pr-issue-link.yml

📜 Recent review details

⏰ Context from checks skipped due to timeout. (1)

• GitHub Check: Kilo Code Review

🧰 Additional context used

🪛 zizmor (1.28.0)

.github/workflows/bot-autoassign-pr-issue-link.yml

[error] 7-7: overly broad permissions (excessive-permissions): issues: write is overly broad at the workflow level

(excessive-permissions)

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[warning] 7-7: permissions without explanatory comments (undocumented-permissions): needs an explanatory comment

(undocumented-permissions)

🔇 Additional comments (1)

.github/workflows/bot-autoassign-pr-issue-link.yml (1)

4-10: LGTM!

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📝 Walkthrough

Walkthrough

The pull request workflow now triggers for edited and ready_for_review events in addition to opened, reopened, and closed. Its concurrency group no longer includes the event action, so runs are grouped by repository and pull request number. Permissions and downstream job wiring are unchanged.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 8

✅ Passed checks (8 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is descriptive, uses the required [ci] prefix, and matches the workflow-only change.
Description check	✅ Passed	The description matches the template and covers checklist, changes, and screenshot, with only the issue reference using a PR link instead of Closes #.
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.
Bug Fixes	✅ Passed	Workflow-only GitHub Actions change; regression tests are impractical and no core user-facing bug fix is involved.
Features	✅ Passed	Not a feature request: only a GitHub Actions workflow changed; no app/docs/UI/tests/screenshot requirements apply.
Changes	✅ Passed	Workflow-only change updates trigger types and concurrency; no docs/UI/public API impacted, and no local test path exists.
General Rules	✅ Passed	Workflow-only change is focused, has no obvious security/performance issues, and N/A items (tests/docs/manual path) are appropriately absent.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/update-pr-validation-workflow

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