[Cleanup] Move the fake test helper code into faketestutils package

[komer3]

General:

• [ ] Have you removed all sensitive information, including but not limited to access keys and passwords?
• [ ] Have you checked to ensure there aren't other open or closed Pull Requests for the same bug/feature/question?

Pull Request Guidelines:

1. [ ] Does your submission pass tests?
2. [ ] Have you added tests?
3. [ ] Are you addressing a single feature in this PR?
4. [ ] Are your commits atomic, addressing one change per commit?
5. [ ] Are you following the conventions of the language?
6. [ ] Have you saved your large formatting changes for a different PR, so we can focus on your work?
7. [ ] Have you explained your rationale for why this feature is needed?
8. [ ] Have you linked your PR to an open issue

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 139 lines in your changes missing coverage. Please review.

Project coverage is 37.04%. Comparing base (9fbc7d5) to head (c305bc0). Report is 2 commits behind head on main.

Files	Patch %	Lines
pkg/driver-test/fake-api.go	0.00%	139 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #208 +/- ## ========================================== - Coverage 40.56% 37.04% -3.52% ========================================== Files 24 23 -1 Lines 1622 1749 +127 ========================================== - Hits 658 648 -10 - Misses 930 1067 +137 Partials 34 34 ```

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