Remove cross reference of files between test suites.

[carbolymer]

Changelog

- description: |
    Remove cross reference of files between test suites
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  # - breaking       # the API has changed in a breaking way
  # - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  # - refactoring    # QoL changes
  # - bugfix         # fixes a defect
   - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

There was a data race in CI: sometimes golden files referenced as an input in one test were not yet created in the other test, which was causing spontaneous failures in CI.

This PR copies those golden input files to the respective project's input directory.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff