ci: T8966: add product T-ID title/commit check (opt-in relocation)

[andamasov]

Relocates the central strict T-ID title/commit check into this product repo as an opt-in rule (toggles invalid-task-id), per T8966. Additive — does not change any existing rule.

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[coderabbitai]

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ℹ️ Recent review info

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Configuration used: Repository YAML (base), Central YAML (inherited), Organization UI (inherited)

Review profile: CHILL

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Run ID: 540e1828-6b8e-476b-bf15-06c645b4b2ea

📥 Commits

Reviewing files that changed from the base of the PR and between db96db5 and 5611bb0.

📒 Files selected for processing (1)

• .github/mergify.yml

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated pull request validation rules to enforce consistent task ID formatting in PR titles and commit messages, automatically labeling non-compliant submissions.

Walkthrough

Mergify rule added to validate PR titles and commit first-line format against T-ID convention. When a PR closes or merges with a title or commit message failing the required [scope:]T<digits>: <text> pattern, the invalid-task-id label is toggled.

Changes

Mergify Configuration

Layer / File(s)	Summary
T-ID format validation rule .github/mergify.yml	New pull_request_rules block containing regex conditions that check PR title and commit first line for optional scope: prefix followed by T<digits>: <text>. Toggles invalid-task-id label when format is violated on closed/merged PRs.

Possibly related PRs

• vyos/vyos-cloud-init#101: Both PRs modify .github/mergify.yml's pull_request_rules for T-ID/title/commit-message validation.

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch feat/T8966-product-tid

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