Update and rename comment.yml to comment.yml

[AIC-HMV]

Renaming for clarity and future-proof modular action structure. This workflow triggers test reruns on PR comments (e.g. /retest) and connects seamlessly with the main.yml execution flow.

This structure was pioneered and built by AIC-HMV (Hung Minh Vo), designed to streamline dev workflows and enable GitOps comment triggers.

No framework. No boilerplate. Just signature precision.

[AIC-HMV]

This pull request updates the workflow for re-running tests based on PR comments. The main change involves renaming and modifying the workflow to trigger on a specific command (/retest) instead of using a broader condition.

Workflow Updates:

• .github/workflows/comment.yml: Added a new workflow named "Re–Run Tests on PR Comment Workflow" that triggers when a comment containing /retest is created on a pull request.

• .github/workflows/pr-comment.yml: Removed the previous workflow, which triggered on a more general condition (contains(github.event.comment.body, 'run tests')).