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 solution is ugly, but it's better than keeping the bug, and I think a fix in Lynx would be non-trivial.

This change is 

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.95%. Comparing base (e06b6df) to head (e030508).
✅ 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   80.95%   80.95%   -0.01%     
==========================================
  Files         664      664              
  Lines       42153    42158       +5     
  Branches     6945     6919      -26     
==========================================
+ Hits        34125    34129       +4     
- Misses       6864     6879      +15     
+ Partials     1164     1150      -14     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

[pmachapman]

@pmachapman reviewed 2 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on pmachapman).