Use message generation in downstream bazel builds

[mjcarroll]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.95%. Comparing base (633ce72) to head (5a127e8).
Report is 19 commits behind head on gz-sim8.

❗ Current head 5a127e8 differs from pull request most recent head 0259e6c. Consider uploading reports for the commit 0259e6c to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           gz-sim8    #2311      +/-   ##
===========================================
- Coverage    65.97%   65.95%   -0.02%     
===========================================
  Files          327      327              
  Lines        31328    31329       +1     
===========================================
- Hits         20668    20663       -5     
- Misses       10660    10666       +6     

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[azeey]

@mjcarroll is this still an active PR?