impl(v3): remove deprecated Cloud Channel Reports service

[scotthart]

No description provided.

[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 systematically removes all traces of the deprecated Cloud Channel Reports service from the codebase. By deleting its generation configuration, client library components, and associated documentation, the PR streamlines the project, eliminates unused code, and ensures that developers are not exposed to or reliant on a service that is no longer supported.

Highlights

• Service Configuration Removal: The configuration entry for the deprecated Cloud Channel Reports service has been removed from generator/generator_config.textproto, ceasing its generation.
• Client Library Component Deletion: All client-side components related to the Cloud Channel Reports service, including client headers, implementation files, connection logic, and internal stub details, have been completely removed from the google/cloud/channel/v1/ directory.
• Documentation Cleanup: All documentation references, environment variable definitions, and sample code snippets pertaining to the Cloud Channel Reports service have been purged from the google/cloud/channel/doc/ directory, ensuring documentation consistency.

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[gemini-code-assist]

Code Review

This pull request correctly removes the deprecated CloudChannelReportsService. The changes are comprehensive, deleting the service from the generator configuration, removing all associated source code files (including the client, connection, stubs, mocks, and samples), and updating the documentation to eliminate all references. The deletions are clean and align with the goal of removing the deprecated service. I have no further comments.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.82%. Comparing base (36a0a9c) to head (136356b).
⚠️ Report is 3 commits behind head on prepare-for-v3.0.0.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           prepare-for-v3.0.0   #15898   +/-   ##
===================================================
  Coverage               92.81%   92.82%           
===================================================
  Files                    2354     2354           
  Lines                  216338   216338           
===================================================
+ Hits                   200799   200817   +18     
+ Misses                  15539    15521   -18     

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