ci: add /request-review and /unrequest-review comment commands

[Ma77Ball]

What changes were proposed in this PR?

• Renamed .github/workflows/take-commands.yml → .github/workflows/comment-commands.yml, since the workflow now handles more than just /take and /untake.
• Added a new request-review job that handles two new slash commands on PRs:
  • /request-review @alice @bob requests reviews from the listed users/teams.
  • /unrequest-review @alice cancels a pending review request.
• Authorization: PR author (fast path) or any committer with write/maintain/admin permission. Anyone else is rejected and logged.
• Supports both individual users (@alice) and teams (@org/team-name); routes them to the correct API bucket.
• Strips self-mentions before calling the API so the atomic call doesn't fail over a single bad name.
• Workflow renamed Issue take commands → Comment commands and granted pull-requests: write.
• Avoids the /review namespace so it stays free for future use (e.g., self-review).

Any related issues, documentation, or discussions?

Closes: #4975

How was this PR tested?

Tested on my local fork.

Was this PR authored or co-authored using generative AI tooling?

Co-Authored with Claude Opus 4.7 in Compliance with ASF

[Ma77Ball]

@aglinxinyuan please review.

[Yicong-Huang]

LGTM! This should be useful! Left some minor comments

[Yicong-Huang]

I think we can just allow PR authors to use this. Committers can use GitHub UI already.

[Yicong-Huang]

Just curious, can we also allow copilot to be requested as reviewer?

[Yicong-Huang]

@aglinxinyuan please review.

Can you try it on this PR? I.e., Use /request-review to request review from @aglinxinyuan. It supposed to work.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.72%. Comparing base (b4f3a41) to head (82bb911).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #4986   +/-   ##
=========================================
  Coverage     42.72%   42.72%           
  Complexity     2185     2185           
=========================================
  Files          1031     1031           
  Lines         38152    38152           
  Branches       4004     4004           
=========================================
  Hits          16302    16302           
  Misses        20831    20831           
  Partials       1019     1019           

Flag	Coverage Δ
access-control-service	39.53% <ø> (ø)
agent-service	33.72% <ø> (ø)
amber	43.22% <ø> (ø)
computing-unit-managing-service	0.00% <ø> (ø)
config-service	0.00% <ø> (ø)
file-service	32.18% <ø> (ø)
frontend	33.08% <ø> (ø)
python	88.90% <ø> (ø)
workflow-compiling-service	47.72% <ø> (ø)

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