Add paths-ignore for GitHub actions, ignore cargo mirror update errors in NRL batch install scripts

[climbfuji]

Description

1. Update and add paths-ignore for all GitHub actions workflows.
2. util/nrl/batch_install.sh: ignore errors when updating cargo mirrors, since this is can be unreliable.

Dependencies

None

Issues addressed

None

Applications affected

None

Systems affected

NRL systems, GitHub actions

Testing

• CI: Note whether the automatic tests (GitHub actions tests that run automatically for every commit) pass or not
  • GitHub actions CI tests pass
  • GitHub actions CI tests do not pass (provide explanation)
  • GitHub actions CI tests skipped (provide explanation if necessary)
• New tests added: List and describe any new tests added to GitHub actions
  • ...
• Additional testing: Add information on any additional tests conducted
  • ...

Checklist

• This PR addresses one issue/problem/enhancement or has a very good reason for not doing so.
• These changes have been tested on the affected systems and applications.
• All dependency PRs/issues have been resolved and this PR can be merged.
• All necessary updates to the spack-stack wiki will be made when this PR is merged

[climbfuji]

I updated this workflow while at it, even though it is currently not used. An attempt to re-enable GitHub actions testing for containers failed miserably. Since the containers builds will see a major overhaul for spack-stack-2.1.0, I am not going to invest time to fix these CI container builds now.