[Dev processes] Fixup gsa-key copying instructions, add debug line to rotate_keys.py

[cjllanwarne]

Change Description

Corrects our gsa-key copying instructions (from #14664) to copy the key contents, not the entire secret metadata.

The batch service seems resilient to these badly formed secrets, but the rotate_keys.py script was not.

Security Assessment

Delete all except the correct answer:

• This change has a low security impact

Impact Description

• Not a production change
• Does not add any new information to the secrets, only formats them a useable way.
• Only in dev namespaces

(Reviewers: please confirm the security impact before approving)

[patrick-schultz]

Thanks Chris!

[chrisvittal]

Thanks, Chris!