update contributing expectations for external PR reviews

[MichelleArk]

resolves # N/A

Updating CONTRIBUTING.md to provide more clarity on the review process for community-contributed pull requests:

• ready_for_review triage process
• response from code reviewers within a week
• availability in next release after merge

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (50b85a0) 87.92% compared to head (698825a) 87.84%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9451      +/-   ##
==========================================
- Coverage   87.92%   87.84%   -0.09%     
==========================================
  Files         160      160              
  Lines       21934    21934              
==========================================
- Hits        19286    19267      -19     
- Misses       2648     2667      +19     

Flag	Coverage Δ
integration	85.30% <ø> (-0.18%)	⬇️
unit	62.42% <ø> (ø)

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[emmyoop]

Sounds like a great update! Just some grammar/repeated sentences.

[dbeatty10]

🚀