Cherry-pick #8178 to v1.71.x release branch

[dfawley]

Original PR: #8178

RELEASE NOTES:

• grpc: fix bug causing an extra Read if a compressed message is the same size as the limit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.33%. Comparing base (9c81a91) to head (c8b71a1).
Report is 1 commits behind head on v1.71.x.

Additional details and impacted files

@@             Coverage Diff             @@
##           v1.71.x    #8181      +/-   ##
===========================================
- Coverage    82.37%   82.33%   -0.05%     
===========================================
  Files          387      387              
  Lines        38944    38944              
===========================================
- Hits         32080    32064      -16     
- Misses        5556     5574      +18     
+ Partials      1308     1306       -2     

Files with missing lines	Coverage Δ
rpc_util.go	81.20% <100.00%> (+0.52%)	⬆️

... and 18 files with indirect coverage changes

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