remove awsutils provider and dependent feature, fix bugs

[Nuru]

what

• Remove iam_access_key_max_age and the ability to create AWS Access Keys of predefined lifetime
• Output secrets only when not using SSM Parameter Store
• Enhance testing

why

• We are removing this feature due to the confusion to the community of our terraform users that has been caused by requiring the cloudposse/awsutils Terraform provider to provide the feature. The error messages stemming from the missing provider block configuration are causing more of a support headache than it is worth. Since we implemented this feature, most CI/CD providers have implemented a better way to obtain short-lived CI/CD credentials (e.g. GitHub Actions and CircleCI both support OIDC with AWS, GCP, Azure, etc)
• Secrets that are output from a module, even if marked sensitive, are still stored in plaintext in the Terraform state file, which makes them less secure than AWS Parameter Store.
• Prevent regression of fixed bugs

references

• Closes Dependency Dashboard #54
• Closes Bug: Output error when access key creation disabled #62
• Closes The argument "region" is required, but was not set. #67
• Supersedes and closes Update README.md and docs #68
• Supersedes and closes chore(deps): update terraform cloudposse/ssm-parameter-store/aws to v0.10.0 #69

[Nuru]

/test all

[aknysh]

a few nitpicks

[Nuru]

/test all