Apply disabled widgets style only for menus and set menus styles for QModelMenu and QMenu instances

[dalthviz]

Description

Apply disabled widgets style only for menus (QModelMenu or QMenu instances).

Preview (Windows):

Type of change

• Bug-fix (non-breaking change which fixes an issue)

References

closes #5445

How has this been tested?

• all tests pass with my change
• I check if my changes works with both PySide and PyQt backends
  as there are small differences between the two Qt bindings.

Final checklist:

• My PR is the minimum possible work for the desired functionality

[codecov]

Codecov Report

Merging #5446 (774b483) into main (aebf02b) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #5446   +/-   ##
=======================================
  Coverage   89.23%   89.23%           
=======================================
  Files         599      599           
  Lines       50884    50884           
=======================================
+ Hits        45405    45406    +1     
+ Misses       5479     5478    -1     

Impacted Files	Coverage Δ
napari/components/experimental/chunk/_pool.py	85.71% <0.00%> (-7.94%)	⬇️
napari/_qt/qt_viewer.py	78.89% <0.00%> (+0.20%)	⬆️
napari/_qt/dialogs/qt_package_installer.py	81.67% <0.00%> (+0.39%)	⬆️
napari/utils/theme.py	92.85% <0.00%> (+0.59%)	⬆️
napari/utils/info.py	81.44% <0.00%> (+1.03%)	⬆️
napari/_qt/__init__.py	56.66% <0.00%> (+6.66%)	⬆️

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[psobolewskiPhD]

Thanks! Looks and works correct to me!

[dalthviz]

Note: Seems like the failing check is related with test_qt_dims and #5443

Running the job again to see if this time passes