Fix constants ignoring ExcludeFromContractsGenerationAttribute

[Saancreed]

@Komoszek This one is dedicated for you.

Fixes #164.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@                Coverage Diff                 @@
##             analyzer-issues     #169   +/-   ##
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  Coverage                   ?   82.11%           
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  Files                      ?       34           
  Lines                      ?      995           
  Branches                   ?      117           
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  Hits                       ?      817           
  Misses                     ?      133           
  Partials                   ?       45           

Flag	Coverage Δ
net9.0	82.11% <100.00%> (?)

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[jakubfijalkowski]

+ changelog entry pls

[Saancreed]

• changelog entry pls

I'm holding off with that until #167 is merged to have a general idea about what will get into 4.0.0 release.

[Komoszek]

💋