Move the clippy_ci_panic_test integration into a regular test

[Jarcho]

This has no reason AFAICT to be implemented as an integration test.

r? flip1995

changelog: none

[samueltardieu]

Why not a UI test instead?

#![allow(internal_features)]
#![feature(rustc_attrs)]

#[rustc_delayed_bug_from_inside_query]
fn main() {}
//~^ ICE: delayed bug triggered by #[rustc_delayed_bug_from_inside_query]

View changes since this review

[Jarcho]

Did not know ui_test supported ICEs.

[rustbot]

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[Jarcho]

So it turns out we already had an internal test for this. First two commits move it to a regular test and adapt it so it should run without needing to be reblessed as rustc details change.