chore(tests): add sleep mocks

[daniel-sanche]

Some google3 tests were failing due to timeouts. It seems like there were some tests that preformed up to 10 retries, with exponential backoff between each one

This PR mocks out sleep, so these tests will complete ~ instantly, rather than > 10 mins

[gemini-code-assist]

Summary of Changes

Hello @daniel-sanche, 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 test suite performance issues by mocking time.sleep in specific test cases. Previously, these tests could take over ten minutes to complete due to multiple retries with exponential backoff, leading to timeouts. By mocking the sleep function, the tests now execute almost instantly, improving the reliability and speed of the test pipeline.

Highlights

• Test Performance Improvement: Introduced time.sleep mocking in several tests to prevent timeouts caused by exponential backoff retries, significantly reducing test execution time from potentially over 10 minutes to near instant completion.
• Specific Test Cases Addressed: Applied time.sleep mocks to test_ping_failure_custom_retry, test_get_too_many_requests_retryable_error_failure, and test_get_universe_domain_retryable_error_failure within tests/compute_engine/test__metadata.py.

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[gemini-code-assist]

Code Review

This pull request addresses test timeouts by mocking time.sleep in several tests that involve retry logic with exponential backoff. The changes are correct and will effectively speed up the test suite. I've added a few minor suggestions to improve code clarity by marking unused mock arguments, which is a common Python convention.