cherry-pick #7356 to v1.66.x branch

[dfawley]

RELEASE NOTES:

• tbd

[codecov]

Codecov Report

Attention: Patch coverage is 86.68516% with 96 lines in your changes missing coverage. Please review.

Project coverage is 81.86%. Comparing base (f857020) to head (979b464).
Report is 1 commits behind head on v1.66.x.

Files	Patch %	Lines
rpc_util.go	79.77%	15 Missing and 3 partials ⚠️
mem/buffers.go	82.75%	13 Missing and 2 partials ⚠️
internal/leakcheck/leakcheck.go	86.04%	8 Missing and 4 partials ⚠️
encoding/proto/proto_v2.go	68.96%	5 Missing and 4 partials ⚠️
internal/transport/transport.go	91.91%	4 Missing and 4 partials ⚠️
server.go	78.78%	7 Missing ⚠️
stream.go	91.02%	4 Missing and 3 partials ⚠️
codec.go	82.60%	3 Missing and 1 partial ⚠️
encoding/encoding_v2.go	55.55%	2 Missing and 2 partials ⚠️
experimental/experimental.go	0.00%	4 Missing ⚠️
... and 4 more

Additional details and impacted files

@@             Coverage Diff             @@
##           v1.66.x    #7546      +/-   ##
===========================================
+ Coverage    81.82%   81.86%   +0.04%     
===========================================
  Files          360      362       +2     
  Lines        27542    27865     +323     
===========================================
+ Hits         22537    22813     +276     
- Misses        3802     3845      +43     
- Partials      1203     1207       +4     

Files	Coverage Δ
internal/transport/grpchttp2/http2bridge.go	98.31% <100.00%> (ø)
internal/transport/handler_server.go	89.69% <100.00%> (+0.36%)	⬆️
internal/transport/http2_client.go	91.96% <100.00%> (+0.05%)	⬆️
internal/transport/http2_server.go	90.69% <100.00%> (-0.29%)	⬇️
mem/buffer_pool.go	100.00% <100.00%> (+9.43%)	⬆️
preloader.go	60.00% <100.00%> (+15.55%)	⬆️
stats/stats.go	71.42% <ø> (ø)
internal/transport/controlbuf.go	88.74% <96.66%> (-2.46%)	⬇️
dialoptions.go	89.02% <50.00%> (-0.93%)	⬇️
internal/grpctest/grpctest.go	73.52% <71.42%> (+3.52%)	⬆️
... and 11 more

... and 18 files with indirect coverage changes