Update aws cli to v2

[rezabekf]

What does this PR do and why?

Add instructions and script to migrate AWS CLI v1 to AWS CLI v2.

Issue #, if available

PR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• Added/Updated documentation if applicable.
• Pre-commit checks passed.
• Lint and Nag checks passed.
• If releasing a new version, have you bumped the version make version part=<major|minor|patch>?

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[rezabekf]

FYI, the script only assumes that awscli v1 is installed via yum which is the case at the moment. I thought it would be overkill to check for all the possible ways to install awscli...it can be pip, brew and what not...possibly we could add the official docs links at the end for people to install manually if our way fails?

[cjhar]

Thanks Franco, other than the order this tested okay on a fresh Cloud9 instance in us-east-1

[sdangol]

LGTM