[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 Makes the concurrency key PR-specific so newer events cancel outdated validation runs.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: 8a1521a5-8ea6-47e1-a2e4-ea0d71d4ce2e

📥 Commits

Reviewing files that changed from the base of the PR and between b73540f and 01acfc7.

📒 Files selected for processing (1)

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

📜 Recent review details

🧰 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)

4-4: LGTM!

Also applies to: 9-10

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📝 Walkthrough

Walkthrough

The pull request automation workflow now triggers for edited and ready_for_review events. Its concurrency group no longer includes the event action, so runs for the same pull request and repository share one concurrency group across different actions.

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 and matches the workflow validation changes in the PR.
Description check	✅ Passed	The description clearly matches the workflow trigger and concurrency updates in the changeset.
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; the regression-test requirement is impractical here and the PR touches no core user-facing code.
Features	✅ Passed	Workflow-only change in .github/workflows; no feature-request issue, docs, tests, or UI artifacts are applicable.
Changes	✅ Passed	Workflow-only change; CI only covers site build/QA, and there’s no workflow-specific docs, UI, or public API to update.
General Rules	✅ Passed	Workflow-only change matches the stated objective; no policy, security, performance, docs, or testing issues are evident in the modified file.

✨ 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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