feat(integ-runner): integ-runner enhancements

[corymhall]

This PR adds a couple of enhancements to the integ-runner

1. Add --profiles option which allows you to provide a list of
   AWS profiles to use. This will be used in combination with the
   --parallel-regions option to run the integration tests in parallel
   across multiple accounts + regions.
2. Adds --from-file option that allows you to store a list of tests to
   run (or exclude) in a file, rather than passing test names as
   arguments.
3. Adds --exclude option, which when provided will excluded the tests
   provided as arguments
4. Adds some additional metrics. Now each test will show the total time
   in the logs. Also, if --verbose option is provided a summary will
   be printed which will contain metrics for the entire test.

  --- Integration test metrics ---
Profile mb-dev + Region us-east-2 total time: 349.866
  test/integ.bundling.js: 58.75
  test/integ.lambda-insights-mapping.js: 61.012
  test/integ.assets.lit.js: 61.121
  test/integ.lambda.docker.js: 81.936
  test/integ.log-retention.js: 87.047
Profile mb-dev + Region us-west-2 total time: 359.775
  test/integ.layer-version.lit.js: 72.61
  test/integ.autoscaling.lit.js: 82.82
  test/integ.current-version.js: 84.982
  test/integ.lambda.js: 119.363
Profile mb-dev + Region us-east-1 total time: 378.713
  test/integ.assets.file.js: 67.915
  test/integ.runtime.inlinecode.js: 68.211

There are also a couple of small refactors.

1. Split up workers.test.ts into snapshot-worker.test.ts and integ-worker.test.ts
2. Refactored the extract_workers functions. There used to be two functions snapshotTestBatch and integTestBatch which called singleThreadedXXX functions. Since each request is essentially single threaded I've moved the singleThreadedXXX functions into extract_worker and renamed them to be integTestWorker and snapshotTestWorker

---

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

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• CodeBuild project: AutoBuildProject89A8053A-LhjRyN9kxr8o
• Commit ID: 174751a
• Result: SUCCEEDED
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Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).