fix: set default region

[brivu]

This PR updates the descriptions of the configure_default_region and the configure_profile_region parameters. It also removed the --profile flag from the aws configure set default.region cli command in the configure.sh script. Lastly, it adds testing and validation for configuring both the default region and the profile region.

Currently, there's some confusion regarding the configuration of the default region versus the profile region.

According to the AWS Documentation:

aws configure set default.region:

• This command sets the default region for the AWS CLI. The specified region will be used by default for all AWS CLI commands unless overridden.
  -The value set using default.region is stored in the AWS CLI configuration file (~/.aws/config), specifically in the [default] section.
  -Example usage: aws configure set default.region us-west-2

aws configure set region:

• This command sets the region for the current profile in the AWS CLI configuration. The specified region will be used for commands executed under that specific profile.
  -The value set using region is stored in the AWS CLI configuration file (~/.aws/config) within the specific profile section.
  -Example usage: aws configure set region us-west-2 --profile myprofile

In summary, aws configure set default.region sets the default region for all commands executed by the AWS CLI, while aws configure set region sets the region for a specific profile.