chore: split containers-api tests

[sobolk]

Description of changes

This splits two long running tests in order to:

• decrease total load
• increase stability and retryability (they both running in same job compounds chance of failed attempt)

FWIW this has been split in CLI repo for the same reason
See https://github.com/aws-amplify/amplify-cli/blob/dev/packages/amplify-e2e-tests/src/__tests__/containers-api-1.test.ts
and https://github.com/aws-amplify/amplify-cli/blob/dev/packages/amplify-e2e-tests/src/__tests__/containers-api-2.test.ts

Issue #, if available

Description of how you validated changes

E2E tests run https://app.circleci.com/pipelines/github/aws-amplify/amplify-category-api/1940/workflows/77347e4a-bf0e-4441-83c0-928d111f7fe3

Checklist

• [ x] PR description included
• [ x] yarn test passes
• [ x] Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)
• New AWS SDK calls or CloudFormation actions have been added to relevant test and service IAM policies

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

[alharris-at]

Approving, pending those two split e2e's passing