Retain existing Cognito User Pool config

[pmuens]

What did you implement:

Closes #6499

Ensures that the existing Cognito User Pool Config is retained.

How did you implement it:

Fetch the current config and re-apply it to the params when updating the Cognito User Pool with the desired Trigger config.

How can we verify it:

1. Create a new User Pool
2. Add a tag
3. Deploy the following serverless.yml service

The Trigger config should be updated. The tag should not be removed.

Otherwise you can also run the integration tests.

Todos:

Note: Run npm run test-ci to run all validation checks on proposed changes

• Write tests and confirm existing functionality is not broken.
  Validate via npm test
• Ensure there are no lint errors.
  Validate via npm run lint-updated
  Note: Some reported issues can be automatically fixed by running npm run lint:fix
• Ensure introduced changes match Prettier formatting.
  Validate via npm run prettier-check-updated
  Note: All reported issues can be automatically fixed by running npm run prettify-updated
• Make sure code coverage hasn't dropped
• Provide verification config / commands / resources
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[medikoo]

Looks good!

[hiramatsutaku]

LGTM 👍