chore: remove and ignore intermediate snapshots integration test snapshots

[mrgrain]

When running integration tests, they are executed inside an intermediate directory named cdk-integ.out.*. These files should never be committed to version control. This change removes the last few accidentally committed files, and adds a global gitignore rule to prevent any files being added in future.

The unit tests for integ-runner rely on these (fake) intermediate artifacts for assertions, so they are still included. However these aren't real integreation tests anyway.

---

All Submissions:

• Have you followed the guidelines in our Contributing guide?

Adding new Unconventional Dependencies:

• This PR adds new unconventional dependencies following the process described here

New Features

• Have you added the new feature to an integration test?
  • Did you use yarn integ to deploy the infrastructure and generate the snapshot (i.e. yarn integ without --dry-run)?

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

[gitpod-io]

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 8d5c422
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).