refactor: drop async_graphql engine from executing queries

[meskill]

Summary:
Ignore enableJIT option and use only the JIT engine to execute queries. It's still possible to define this in the config but it won't affect anything.

This is an initial step to drop async_graphql engine and more work should be done:

• rest api uses async_graphql
• introspection is implemented only by async_graphql

Issue Reference(s):
Fixes #3128

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

All modified and coverable lines are covered by tests ✅

Project coverage is 86.44%. Comparing base (d8947cd) to head (652bc31).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3223      +/-   ##
==========================================
+ Coverage   86.41%   86.44%   +0.02%     
==========================================
  Files         282      282              
  Lines       28773    28756      -17     
==========================================
- Hits        24865    24858       -7     
+ Misses       3908     3898      -10     

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