Add regression tests for rust-lldb python wrappers

[pnkfelix]

I am posting this issue mostly as a reminder that we should investigate why our current test suite didn't seem to catch the breakage from #76006 on any of our CI platforms

[ehuss]

Looking through the history, it doesn't appear that there were ever any tests added for the python wrappers.

However, I did notice something concerning (unrelated to the above issue). All of the // rust-lldb tests are no longer being run with lldb. These are tests that are intended to run with the rust-variant of lldb, but that has been removed (#72058). The following tests are affected:

• struct-style-enum.rs
• method-on-generic-struct.rs
• tuple-style-enum.rs
• unique-enum.rs
• generic-method-on-generic-struct.rs
• borrowed-enum.rs
• generic-struct.rs
• associated-types.rs
• generic-tuple-style-enum.rs

I'm not sure if any of these tests specifically need to be a "rust" variant of lldb, or just need a relatively new version of lldb. The rust-variant requirement was added in #54764.

I tried running some of the tests with my system lldb, and the format of the output has changed, so they seem to fail.