[CI] Add pre-commit hook shellcheck-py to lint shell files

[jbampton]

https://github.com/shellcheck-py/shellcheck-py

https://www.shellcheck.net/

https://github.com/koalaman/shellcheck

Did you read the Contributor Guide?

• Yes, I have read the Contributor Rules and Contributor Development Guide

Is this PR related to a JIRA ticket?

• No

What changes were proposed in this PR?

Added another check/test to our pre-commit framework to check the syntax of shell files.

Cleaned up and standardized some shell files.

How was this patch tested?

Ran locally: pre-commit run --all-files

Did this PR include necessary documentation updates?

• No, this PR does not affect any public API so no need to change the documentation.