misc: Enhance switch decorator to wrap classes

[EdCaunt]

Introducing this to minimise the number of switchconfigs needed for tests for cleaner code and reduced maintenance - the decorator can now be applied to the test class and will wrap all methods of the class (the tests themselves)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.85%. Comparing base (b779816) to head (decf4c3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2831      +/-   ##
==========================================
- Coverage   78.99%   78.85%   -0.15%     
==========================================
  Files         248      248              
  Lines       50837    50849      +12     
  Branches     4392     4395       +3     
==========================================
- Hits        40158    40095      -63     
- Misses       9879     9938      +59     
- Partials      800      816      +16     

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