Add PR workflow to suggest impacted Teleport features for manual regression testing

[Copilot]

This PR adds an automated PR-time analysis that maps changes to a provided Teleport feature matrix and comments with targeted manual test suggestions. It runs whenever a PR is created or updated, using changed files plus PR text to infer potentially impacted features.

• New workflow

  • Added .github/workflows/feature-impact.yaml.
  • Triggers on pull_request_target for: opened, reopened, synchronize, edited, ready_for_review.
  • Configured minimal token scope (pull-requests: write) and per-PR concurrency to avoid duplicate runs.

• Agentic feature-impact matching

  • Embedded the provided feature matrix (IDs, keywords, path hints, relevant paths, relationships, docs).
  • Computes direct feature matches from:
    • path-prefix matches against relevant_paths
    • substring/path-hint matches against paths_hint
    • keyword matches in PR title/body
  • Expands suggestions through matrix relationships:
    • depends_on, gated_by, optionally_gated_by, emits, related_to

• PR comment behavior

  • Posts a structured “Suggested manual feature testing” comment.
  • Includes match rationale and doc links per feature.
  • Uses a marker comment and updates in place on subsequent PR events (idempotent, single bot comment).

Example from the workflow logic:

on:
  pull_request_target:
    types: [opened, reopened, synchronize, edited, ready_for_review]

const relationFields = ['depends_on', 'gated_by', 'optionally_gated_by', 'emits', 'related_to'];
// direct match scoring from changed files + PR text, then relation expansion for related impacts

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	github/​actions/​github-script@​ed597411d8f924073f98dfc5c65a23a2325f34cd

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