ci: use cargo insta to run tests

[meskill]

Summary:

• use cargo insta runner instead of cargo llvm when the coverage is not needed. This allows to fail when unreferenced snapshots found and this forces the explicit removal of snapshots in the prs that removes the related tests
• drop jit_test workflow
• force update snapshots to the new insta format. It's to minimize noise in the future prs that updates snapshots

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

All modified and coverable lines are covered by tests ✅

Project coverage is 86.78%. Comparing base (0f3721b) to head (a3a63b7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3220   +/-   ##
=======================================
  Coverage   86.78%   86.78%           
=======================================
  Files         281      281           
  Lines       28443    28443           
=======================================
  Hits        24683    24683           
  Misses       3760     3760           

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