refactor: use if clauses in list comprehensions to make code more pythonic

[federicobond]

This PR

Rewrites the _execute_hooks* functions to be more pythonic. This improves readability and makes the code faster since it avoids the creation of intermediate structures.

I also removed the null guards since the functions are typed as receiving lists always.

[codecov]

Codecov Report

Merging #215 (f607b9a) into main (84af1ae) will increase coverage by 0.28%.
Report is 1 commits behind head on main.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main     #215      +/-   ##
==========================================
+ Coverage   93.34%   93.63%   +0.28%     
==========================================
  Files          16       16              
  Lines         451      440      -11     
==========================================
- Hits          421      412       -9     
+ Misses         30       28       -2     

Flag	Coverage Δ
unittests	93.63% <87.50%> (+0.28%)	⬆️

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Files	Coverage Δ
openfeature/evaluation_context.py	91.66% <100.00%> (+0.75%)	⬆️
openfeature/hook/hook_support.py	90.32% <100.00%> (+3.83%)	⬆️
openfeature/hook/__init__.py	83.33% <50.00%> (-2.78%)	⬇️

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[beeme1mr]

Honestly, I'm not entirely sure what's happening in this change 😅. Perhaps someone with some more Python experience can chime in.

@justinabrahms @tcarrio @jamescarr

[beeme1mr]

The tests pass and this is just an internal refactor.