<Binary/Other>CopyAndPublish.yml: Use bash to parse parameter string

[makubacki]

Uses bash to parse a parameter string that could be empty since it is more robust and consistent than directly depending on pipeline string interpretation logic.

This treats the following strings as "empty":

• ""
• " "

[makubacki]

Note: Tested in PR https://github.com/microsoft/mu_tiano_platforms/pull/525