Run S3 source integration tests as GHA

[dlvenable]

Is your feature request related to a problem? Please describe.

The s3 source integration tests do not run automatically. Thus, PRs may be breaking behavior without our knowing.

Describe the solution you'd like

Run the s3 source integration tests as part of the GitHub Action. To support this, create an S3 bucket and SQS queue in the testing CDK.

It may also be advantageous to update the tests to write to a key prefix depending on the use-case: SQS notifications versus S3 scan. Then the SQS queue can trigger for events only a known key prefix. This way we don't need a bucket per use-case.