fix: do not mark enums and scalars as input types

[meskill]

Summary:
Briefly describe the changes made in this PR.

Issue Reference(s):
Fixes #2227

Build & Testing:

• [ ] I ran cargo test successfully.
• [ ] I have run ./lint.sh --mode=fix to fix all linting issues raised by ./lint.sh --mode=check.

Checklist:

• [ ] I have added relevant unit & integration tests.
• [ ] I have updated the documentation accordingly.
• [ ] I have performed a self-review of my code.
• [ ] PR follows the naming convention of <type>(<optional scope>): <title>

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 89.65517% with 3 lines in your changes missing coverage. Please review.

Project coverage is 86.21%. Comparing base (1873dc8) to head (7ef7a73).

Files	Patch %	Lines
src/core/config/config.rs	86.36%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2241 +/- ## ========================================== - Coverage 86.23% 86.21% -0.02% ========================================== Files 212 212 Lines 20440 20427 -13 ========================================== - Hits 17626 17612 -14 - Misses 2814 2815 +1 ```

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