chore: update sources and regenerate

[noahdietz]

Update googleapis and discovery sources, then regenerate all clients.

[gemini-code-assist]

Code Review

This pull request contains auto-generated updates across multiple Google Cloud Rust SDK clients, reflecting API updates up to revision 20260629. Key changes include the addition of target audience and access permission settings in the Google Chat API, new named set router subresources in the Compute Engine API, relevance filter specifications in the Discovery Engine API, managed rotation support for typed secrets in the Secret Manager API, and AI agent monitoring/anomaly detection fields in the Security Center API. Since all modifications are within generated code, no manual code changes or review feedback are required.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.02%. Comparing base (73a3a4b) to head (a6a7e65).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6053   +/-   ##
=======================================
  Coverage   97.02%   97.02%           
=======================================
  Files         252      252           
  Lines       63526    63526           
=======================================
  Hits        61639    61639           
  Misses       1887     1887           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.