lib/tests/modules.sh: Improve failure log format

- Clear separation between failures
- Move error regex close to error message, which is at the bottom
  of a fairly long trace
- Move most relevant and consistent info to bottom of terminal:
  the location of the failure.
  Some editors including vscode heuristically resolve file paths
  on Ctrl+click.
- Less wordy - easy to glance
- Capitalized prefixes to distinguish from Nix's own logging

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