Merge --v2-debug migration debug mode to develop

[aemous]

Description of changes:

• Merge the following PRs, previously reviewed and approved:
  • https://github.com/aws/aws-cli/pull/9703
  • https://github.com/aws/aws-cli/pull/9808
  • https://github.com/aws/aws-cli/pull/9810
  • https://github.com/aws/aws-cli/pull/9899

Description of tests:

• Manually tested various breaking change warnings.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.