Check that the generated pb.rs file matches

[bantonsson]

What does this PR do?

Adds a check that the auto-generated pb.rs file in trace-protobuf matches the definitions in build.rs.

Motivation

The pb.rs file is auto-generated from the protobuf files and the definitions in build.rs and it's easy to only edit the pb.rs file and forget the definitions in the build.rs file.

Additional Notes

Anything else we should know when reviewing?

How to test the change?

Describe here in detail how the change can be validated.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.63%. Comparing base (ff7ce41) to head (62cae11).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #501      +/-   ##
==========================================
+ Coverage   69.39%   69.63%   +0.24%     
==========================================
  Files         201      201              
  Lines       26846    26930      +84     
==========================================
+ Hits        18631    18754     +123     
+ Misses       8215     8176      -39     

Components	Coverage Δ
crashtracker	16.70% <ø> (ø)
datadog-alloc	98.76% <ø> (ø)
data-pipeline	51.30% <ø> (ø)
data-pipeline-ffi	0.00% <ø> (ø)
ddcommon	85.97% <ø> (ø)
ddcommon-ffi	74.15% <ø> (ø)
ddtelemetry	56.37% <ø> (ø)
ipc	84.66% <ø> (ø)
profiling	78.63% <ø> (+0.64%)	⬆️
profiling-ffi	58.19% <ø> (ø)
serverless	0.00% <ø> (ø)
sidecar	36.26% <ø> (ø)
sidecar-ffi	0.00% <ø> (ø)
spawn-worker	54.98% <ø> (ø)
trace-mini-agent	69.36% <ø> (ø)
trace-normalization	97.79% <ø> (ø)
trace-obfuscation	95.75% <ø> (ø)
trace-protobuf	77.16% <100.00%> (+24.59%)	⬆️
trace-utils	91.61% <ø> (ø)