fix(compute/v1): feature-gate add-ons

[coryan]

The code only compiled if a service with LROs was enabled. The hand-crafted code to extend Operation should only be included if that type is defined. The generator now emits a helpful internal-only feature for that purpose.

Fixes #6220

[gemini-code-assist]

Code Review

This pull request introduces a new internal feature gate __enable-discovery-LRO in the generated google-cloud-compute-v1 crate. It updates Cargo.toml to associate this feature with various client features, and conditionally compiles LRO-related errors, operation implementations, and tests in errors.rs and operation.rs using #[cfg] attributes. There are no review comments to evaluate, and I have no additional feedback to provide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.18%. Comparing base (207064f) to head (cb2a5de).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6384   +/-   ##
=======================================
  Coverage   96.18%   96.18%           
=======================================
  Files         288      288           
  Lines       75394    75394           
=======================================
+ Hits        72517    72521    +4     
+ Misses       2877     2873    -4     

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[dbolduc]

Thoughts on CI updates?

[coryan]

Thoughts on CI updates?

Funny that you ask, I was working on them...