fix: remove duplicate protos

[coryan]

This change is 

[google-cloud-cpp-bot]

Google Cloud Build Logs
For commit: 44d370bd51783f916e105a7a42f1c2533dbe1964

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[codecov]

Codecov Report

Base: 93.94% // Head: 93.94% // No change to project coverage 👍

Coverage data is based on head (713022a) compared to base (07d51b6).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10486   +/-   ##
=======================================
  Coverage   93.94%   93.94%           
=======================================
  Files        1626     1626           
  Lines      147457   147457           
=======================================
  Hits       138524   138524           
  Misses       8933     8933           

Impacted Files	Coverage Δ
...integration_tests/schema_admin_integration_test.cc	98.88% <0.00%> (-1.12%)	⬇️
...le/cloud/storage/internal/curl_download_request.cc	88.29% <0.00%> (-1.01%)	⬇️
google/cloud/completion_queue_test.cc	97.13% <0.00%> (-0.20%)	⬇️
...ud/spanner/integration_tests/client_stress_test.cc	84.86% <0.00%> (+0.65%)	⬆️
...cloud/pubsub/internal/subscription_session_test.cc	98.49% <0.00%> (+0.66%)	⬆️

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[google-cloud-cpp-bot]

Google Cloud Build Logs
For commit: 713022a6f81ca0e862f3b885a37507118998c8fa

• Public Access Build Logs
• Cloud Build Console (requires auth)
• Kokoro Logs (requires auth)

ℹ️ NOTE: Kokoro logs are linked from "Details" below.