[WIP] Support @semanticNonNull in Fusion

[tobias-tengler]

Depends on #7731

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.37%. Comparing base (becfc54) to head (d98db92).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7894      +/-   ##
==========================================
+ Coverage   74.32%   74.37%   +0.04%     
==========================================
  Files        2880     2882       +2     
  Lines      150293   150488     +195     
  Branches    17479    17514      +35     
==========================================
+ Hits       111709   111924     +215     
+ Misses      32767    32746      -21     
- Partials     5817     5818       +1     

Flag	Coverage Δ
unittests	74.37% <ø> (+0.04%)	⬆️

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