Make includeDeprecated non nullable.

[michaelstaib]

Closes #8094

Pull Request Overview

This PR updates the includeDeprecated argument to be non-nullable across introspection types to ensure consistent and clear usage.

• Changed includeDeprecated type from nullable Boolean to non-nullable Boolean.
• Removed redundant boolean type declarations in __Field.cs and __Directive.cs.
• Updated default values to reflect the non-nullable change.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

File	Description
src/HotChocolate/Core/src/Types/Types/Introspection/__Type.cs	Updated includeDeprecated argument to use a non-nullable Boolean type and introduced nonNullBooleanType.
src/HotChocolate/Core/src/Types/Types/Introspection/__Field.cs	Replaced nullable Boolean declaration with non-nullable Boolean for includeDeprecated.
src/HotChocolate/Core/src/Types/Types/Introspection/__Directive.cs	Removed the redundant nullable Boolean type and updated includeDeprecated argument to non-nullable.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.01%. Comparing base (33896d9) to head (9f7818f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8124      +/-   ##
==========================================
- Coverage   74.01%   74.01%   -0.01%     
==========================================
  Files        2664     2664              
  Lines      140294   140289       -5     
  Branches    16336    16336              
==========================================
- Hits       103844   103838       -6     
  Misses      30881    30881              
- Partials     5569     5570       +1     

Flag	Coverage Δ
unittests	74.01% <ø> (-0.01%)	⬇️

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