chore: remove some usages of cdktf from tests

[gabegorelick]

We have some tests that use cdktf providers instead of cdktn.

Description

Remove dependency on @cdktf/provider-* packages from tests. Also, install cdktn instead of cdktf in tests.

Checklist

• I have updated the PR title to match CDKTN's style guide
• I have run the linter on my code locally
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation if applicable
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works if applicable
• New and existing unit tests pass locally with my changes

[so0k]

should we pick this back up? We are not really supporting dual dependencies anymore and have been publishing pre-built providers for a while - do we still need to support really old cdktf providers?

[gabegorelick]

Yes, we should finish this. The test failures should be fixable if we can get rid of cdktf support.

I can try to find the time to finish this. Otherwise, feel free to pick this up if you want.