chore: squelch additional deprecated warnings

[scotthart]

These were missed in prior PRs.

---

This change is 

[gemini-code-assist]

Summary of Changes

Hello @scotthart, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses lingering deprecation warnings in two specific test files, cbt_test_proxy.cc and transaction_test.cc. By strategically including diagnostic control headers, the changes ensure that these warnings are suppressed during compilation, contributing to a cleaner build output and aligning with previous efforts to manage deprecation notices.

Highlights

• Deprecation Warning Suppression: Implemented includes for "disable_deprecation_warnings.inc" and "diagnostics_pop.inc" in cbt_test_proxy.cc and transaction_test.cc to suppress previously missed deprecation warnings.

Changelog

• google/cloud/bigtable/test_proxy/cbt_test_proxy.cc
  • Included google/cloud/internal/disable_deprecation_warnings.inc at the top of the file.
  • Included google/cloud/internal/diagnostics_pop.inc at the end of the file.
• google/cloud/spanner/transaction_test.cc
  • Included google/cloud/internal/disable_deprecation_warnings.inc at the top of the file.
  • Included google/cloud/internal/diagnostics_pop.inc at the end of the file.

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[gemini-code-assist]

Code Review

This pull request adds includes to suppress deprecation warnings in cbt_test_proxy.cc and transaction_test.cc. These changes are correct and help reduce compiler noise. The changes look good to me.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.63%. Comparing base (44f0334) to head (40dd560).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15985      +/-   ##
==========================================
- Coverage   92.64%   92.63%   -0.01%     
==========================================
  Files        2334     2334              
  Lines      214633   214633              
==========================================
- Hits       198840   198832       -8     
- Misses      15793    15801       +8     

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