Simplify backup restore failure messaging and add call-to-action

[codyc1515]

Proposed change

Simplify backup restore failure messaging and add call-to-action.

Type of change

• [ ] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (which adds functionality to the supervisor)
• [ ] Breaking change (fix/feature causing existing functionality to break)
• [x] Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:
• Link to cli pull request:

Checklist

• [ ] The code change is tested and works locally.
• [x] Local tests pass. Your PR cannot be merged unless tests pass
• [x] There is no commented out code in this PR.
• [x] I have followed the [development checklist][dev-checklist]
• [x] The code has been formatted using Black (black --fast supervisor tests)
• [ ] Tests have been added to verify that the new code works.

[agners]

@codyc1515 there is a test failure in the test_restore_immediate_errors test case. The test case checks the message. Can you update the test case as well? Thanks!

[github-actions[bot]]

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