Rollup merge of #144497 - Enselic:basic-stepping, r=Mark-Simulacrum

tests: Add test for basic line-by-line stepping in a debugger

Let's wait with lldb testing until the test works properly with gdb.

This is a regression test to prevent further regressions of rust-lang/rust#33013 which unfortunately regressed in **nightly-2023-04-24**. See rust-lang/rust#33013 (comment).

Author: Zalathar