fix(ci): make sure Rust tests actually run in deploy-gcp-tests.yml

[teor2345]

Motivation

It's easy to accidentally skip a test in CI, and not notice.
We want to check that we're actually running tests, and that they are succeeding.

Part of #2653.

Depends-On: #4704

Solution

In deploy-gcp-tests.yml:

• before checking the exit status, check for "test result: 1 passed" in the logs
• use a regex to allow multiple tests, even though we only currently run one
• fail if the test logs don't show a success, or the test command returns a failing exit status

This PR does not check tests in any other workflows.

Review

This is a low priority, but it seemed easy to fix while I was in that file.

Reviewer Checklist

• Existing tests pass

[teor2345]

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