Fix BackendValues in backend-comparison after removal of jit suffix

[syl20bnr]

This PR also sorts the variants alphabetically like in the Cargo.toml file.

[laggui]

Good catch, makes more sense to match the new backend flags.

The audit CI failure is due to polars 0.44.2, looks like they just released 0.46.0 a couple days ago that fixed the dependency causing this issue.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.57%. Comparing base (04c5e74) to head (b03eebe).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/burn-remote/src/server/session.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2756   +/-   ##
=======================================
  Coverage   83.57%   83.57%           
=======================================
  Files         824      824           
  Lines      108453   108453           
=======================================
  Hits        90639    90639           
  Misses      17814    17814           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.