Add a test to validate changing code and env vars

[willthames]

Description of changes:

Create a test that updates both function code and environment variables at the same time.

In theory, both should work, but there is currently a bug that means that only the code gets updated. This test should allow validation of any fix.

Issue #, if available: aws-controllers-k8s/community#1968

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

[ack-prow]

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This pull-request has been approved by: willthames
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[ack-prow]

Hi @willthames. Thanks for your PR.

I'm waiting for a aws-controllers-k8s member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[willthames]

This is based on #203 because the test suite doesn't work for me without #203 (for this test, the main problem is non-matching sha256 hashes)

If #203 is rejected then I can unpick the changes but won't be able to validate that the tests succeed locally!