feat(integ-runner): support custom --test-regex to match integ test files

[mrgrain]

Follow-up to #22761. To support other languages than JavaScript (see #22521) we need to be able to detect test files with any patterns. With this PR, users can specify a number of custom --test-regex patterns that will bed used to discover integration test files. Together with --app this can already be used to run integ tests in arbitrary languages.

Example usage: integ-runner --app="python3 {filePath}" --test-regex="^integ_.*\.py$"

Also contains a minor refactor to make --app available via IntegrationTests.fromFile(). This is in preparation of an upcoming change to reestablish support for an integration test config file.

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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]

[corymhall]

Just one minor suggestion, feel free to remove the do-not-merge label.

[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).

[aws-cdk-automation]

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• Commit ID: daba17f
• 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).