fix(oslogin): Fixing a flaky issue with OSLogin SSH tests

[m-strzelczyk]

Description

Fixes #7277 (again)

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• Please merge this PR for me once it is approved.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample

[dandhlee]

Instead of retrying in this file, is it possible to retry with backoff on the test?

[m-strzelczyk]

Instead of retrying in this file, is it possible to retry with backoff on the test?

The test itself is already using the @retry decorator, but it seems to fail anyway... or perhaps the decorator is not working as intended?

[dandhlee]

SGTM to give this a try.

[iennae]

just looks like you need to update the branch and verify that checks still past and then this is ok to merge.