add cleanup of generated env files to end of tests

[rtpascual]

Problem

When running tests, generated env files for functions are left behind. This is only a problem locally (since test runners always run on clean environment) because writing tests that rely on existence/non-existence of these files may yield different results compared to test runners which will lead to confusion.

Issue number, if available:

Changes

Cleans up generated function env files at the end of tests that contain functions that generate them.

Corresponding docs PR, if applicable:

Validation

Made sure there are no generated function env files after running entire test suite. Unit tests should still pass.

Checklist

• If this PR includes a functional change to the runtime behavior of the code, I have added or updated automated test coverage for this change.
• If this PR requires a change to the Project Architecture README, I have included that update in this PR.
• If this PR requires a docs update, I have linked to that docs PR above.
• If this PR modifies E2E tests, makes changes to resource provisioning, or makes SDK calls, I have run the PR checks with the run-e2e label set.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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Latest commit: 5eb2848

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