Add job to `jit.yml` to build and test with `--disable-gil`

[savannahostrowski]

I recently fixed #118935, so I figure we probably want a job in the JIT CI that checks that nothing regresses over time.

Linked PRs

• gh-119292: Add job to jit.yml to build and test with --disable-gil #119293
• [3.13] GH-119292: Add job to JIT CI to build and test with --disable-gil (GH-119293) #119314