Rollup merge of #144499 - Enselic:ci-debuginfo-level-tests, r=davidtwco

ci: Begin running ui tests with `rust.debuginfo-level-tests=1`

To reduce risk of regressing on generating debuginfo e.g. in the form of ICE:s. This will also ensure that future ui tests work with different debuginfo levels. See rust-lang/rust#61117.

When I looked at run time for different CI jobs, **x86_64-gnu-debug** was far from the bottleneck, so it should be fine to make it perform more work.

A handful of tests are failing so we need to force debuginfo=0 on those for now.

We'll start small with debuginfo=1. We'll step up to debuginfo=2 once most (all?) tests can handle debuginfo=1. There are more failures with debuginfo=2 than with debuginfo=1.

Author: samueltardieu