chore(bigquery): adjust test assertions to new default timeout

[plamut]

Fixes #10221.

This PR adjusts a few unit test assertions to the new default timeout in core.

How to test

• Run unit tests on the latest master branch.

Actual result (before the fix):
A few tests fail due to the timeout argument mismatch.

Expected result (after the fix):
All tests pass as they should.

PR checklist:

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)