Fix 2 minor LSP errors

[cedarbaum]

Summary

This PR makes two small fixes to avoid reporting errors in the Java language server used by VSCode (version JavaSE-21):

• Annotate OccupancyStatus with its enum type, as is done for other DocumentedEnum implementations.
• Move TestDataFetcherDecorator to its correct package path.

With these 2 fixes, the LSP now reports no errors and only warnings.

Though these changes do not affect compilation when using mvn (and I assume are treated as warnings in IntelliJ and/or other Java compilers/lsps), I believe they are both good/safe changes regardless of IDE or Java version compatibility.

Issue

N/A

Unit tests

Existing compilation and unit tests should be sufficient to cover these small changes.

Documentation

N/A

Changelog

skip changelog tag should be used for this change.

Bumping the serialization version id

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.80%. Comparing base (969fb44) to head (e23144b).
Report is 5 commits behind head on dev-2.x.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6374      +/-   ##
=============================================
- Coverage      69.80%   69.80%   -0.01%     
+ Complexity     17943    17941       -2     
=============================================
  Files           2046     2046              
  Lines          76671    76671              
  Branches        7830     7830              
=============================================
- Hits           53520    53518       -2     
- Misses         20408    20410       +2     
  Partials        2743     2743              

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[leonardehrenfried]

I've taken the liberty to skip the second reviewer.