chore: Add missing test cases for DisableFileSystemWatcher setting.

[jaffinito]

Description

Add a pair of missing test cases for DisableFileSystemWatcher.

Author Checklist

• Unit tests, Integration tests, and Unbounded tests completed
• Performance testing completed with satisfactory results (if required)

Reviewer Checklist

• Perform code review
• Pull request was adequately tested (new/existing tests, performance tests)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.59%. Comparing base (a6c4e74) to head (27154dc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2558   +/-   ##
=======================================
  Coverage   80.59%   80.59%           
=======================================
  Files         459      459           
  Lines       28927    28927           
  Branches     3177     3177           
=======================================
  Hits        23315    23315           
  Misses       4822     4822           
  Partials      790      790           

Flag	Coverage Δ
Agent	81.49% <ø> (ø)
Profiler	72.59% <ø> (ø)

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