CI: Add path-based triggers

[aviatesk]

Separates LSP testing into its own workflow file and adds path-based triggers to all workflows to avoid unnecessary runs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.23%. Comparing base (7b2b498) to head (f0af4ea).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #319   +/-   ##
=======================================
  Coverage   64.23%   64.23%           
=======================================
  Files          40       40           
  Lines        4214     4214           
=======================================
  Hits         2707     2707           
  Misses       1507     1507           

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