feat: drop support for json yaml from Config

[meskill]

Summary:
Briefly describe the changes made in this PR.

Issue Reference(s):
Fixes #... (Replace "..." with the issue number)

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]

Codecov Report

Attention: Patch coverage is 91.17647% with 3 lines in your changes missing coverage. Please review.

Project coverage is 86.66%. Comparing base (858ac97) to head (30691fd).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/core/config/config.rs	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3201      +/-   ##
==========================================
- Coverage   86.75%   86.66%   -0.09%     
==========================================
  Files         278      278              
  Lines       27963    27932      -31     
==========================================
- Hits        24258    24206      -52     
- Misses       3705     3726      +21     

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