Ensure PID files are cleaned up after migration

[dmjb]

Now that we now longer create PID files for new workloads, ensure they get cleaned up during the status migration process.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 56.36%. Comparing base (b34f7d3) to head (6dd746f).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/workloads/statuses/file_status.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2905   +/-   ##
=======================================
  Coverage   56.36%   56.36%           
=======================================
  Files         323      323           
  Lines       31764    31763    -1     
=======================================
  Hits        17904    17904           
+ Misses      12331    12330    -1     
  Partials     1529     1529           

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[dmjb]

The e2e test failures are strange since they should never hit this codepath. Will investigate this when I get the chance.