SF-3844 SF-3786 SF-3914 Clear Lynx insights of a checker that stops reporting

[Nateowami]

The real bug is that Lynx does not report when a diagnostic/checker no longer has any problems to report; it just stops reporting instead.

This change is 

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.31%. Comparing base (cee8d4d) to head (53570d0).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ate/editor/lynx/insights/lynx-workspace.service.ts	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4085      +/-   ##
==========================================
- Coverage   81.31%   81.31%   -0.01%     
==========================================
  Files         670      670              
  Lines       43474    43479       +5     
  Branches     7127     7134       +7     
==========================================
+ Hits        35349    35353       +4     
- Misses       6936     6951      +15     
+ Partials     1189     1175      -14     

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