impl(v3): delete absl quiet headers

[scotthart]

This PR removes the absl_quiet_str_*.h wrapper headers and uses the absl/strings/str_*.h headers directly. It makes the necessary updates to the generator, generated code, and handwritten code.

[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 streamlines the project's dependency on Abseil string utilities by eliminating an intermediate layer of custom wrapper headers. By directly incorporating the standard Abseil string headers, the change simplifies the build process and reduces maintenance overhead, affecting both the code generation logic and the generated client libraries.

Highlights

• Abseil Header Simplification: The custom absl_quiet_str_*.h wrapper headers have been removed, and the codebase now directly uses the standard absl/strings/str_*.h headers for string manipulation functions like StrCat, StrJoin, and StrReplace.
• Build System Update: The ci/cloudbuild/builds/checkers.sh script has been updated to remove a specific sed_edit transformation that was previously used to fix Abseil header issues on MSVC+x86, indicating that the custom wrappers are no longer needed.
• Code Generation Alignment: The code generator and its generated output across numerous service clients and internal utilities have been updated to reflect the direct usage of standard Abseil string headers, ensuring consistency throughout the project.

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[gemini-code-assist]

Code Review

This pull request removes the absl_quiet_str_*.h wrapper headers and directly uses the Abseil string headers. This is a great cleanup, removing a workaround that is no longer necessary. The changes are applied consistently across the codebase, including updates to the generator, generated code, and handwritten code. The removal of the fixup script in ci/cloudbuild/builds/checkers.sh is also correct. The changes are mostly mechanical and look good.

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.82%. Comparing base (c083ccf) to head (91095d9).

Files with missing lines	Patch %	Lines
...ator/internal/metadata_decorator_rest_generator.cc	0.00%	2 Missing ⚠️
generator/internal/option_defaults_generator.cc	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                   @@
##           prepare-for-v3.0.0   #15897      +/-   ##
======================================================
- Coverage               92.82%   92.82%   -0.01%     
======================================================
  Files                    2354     2354              
  Lines                  216300   216298       -2     
======================================================
- Hits                   200779   200776       -3     
- Misses                  15521    15522       +1     

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