Move clipboard tests into a __tests__ sub directory

[bjoernricks]

What

Move clipboard tests into a __tests__ sub directory

Why

Use same directory structure as for all other tests too.

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA 857e72f.

Ensure that dependencies are being submitted on PR branches and consider enabling retry-on-snapshot-warnings. See the documentation for more information and troubleshooting advice.

Scanned Files

None

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.09%. Comparing base (0a0b0ef) to head (857e72f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5538   +/-   ##
=======================================
  Coverage   84.09%   84.09%           
=======================================
  Files        1293     1293           
  Lines       33766    33766           
  Branches    10056    10056           
=======================================
  Hits        28395    28395           
  Misses       4821     4821           
  Partials      550      550           

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