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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ℹ️ Recent review info

⚙️ Run configuration

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

Review profile: CHILL

Plan: Pro

Run ID: 0c66704e-c5a4-41b5-98a2-50c35735b998

📥 Commits

Reviewing files that changed from the base of the PR and between 779cfe1 and 5d9635f.

📒 Files selected for processing (1)

• .github/mergify.yml

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated internal GitHub automation configuration for pull request validation.

Walkthrough

Adds a Mergify pull_request_rules entry in .github/mergify.yml to validate T-ID format compliance in PR titles and commit messages. The rule flags violations of the T<digits>: <text> pattern (with optional scope: prefix) by applying the invalid-task-id label.

Changes

T-ID Format Validation

Layer / File(s)	Summary
Mergify T-ID validation rule .github/mergify.yml	New pull_request_rules item enforces T<digits>: <text> (optional scope: prefix) format on PR titles and commit first lines, applying invalid-task-id label when format violations are detected.

Possibly related PRs

• vyos/vyatta-biosdevname#12: Prior PR modifies the same .github/mergify.yml T-ID validation rules; this PR adds the invalid-task-id labeling rule while the prior PR removed local rules in favor of baseline T-ID checks.

✨ Finishing Touches

✨ Simplify code

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

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