Enable CI/CD pipeline triggers from merge request comments to support GitHub Actions-like workflows

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Problem

GitLab currently cannot trigger pipelines from MR comments, unlike GitHub which supports issue_comment events. This prevents creating tools like claude-code-action for GitLab.

Proposal

Add support for comment-triggered pipelines:

deploy:
  rules:
    - if: '$CI_PIPELINE_SOURCE == "comment" && $CI_COMMENT_TEXT =~ /@claude/'
  script:
    - echo "Triggered by comment"

Use case

Bot integrations (like claude-code-action)

Without this feature, GitLab users must rely on external webhooks, making the platform less competitive with GitHub Actions.