Running `./x test tests/debuginfo` triggers recompiles for debugger visualizer script changes

[Walnut356]

After making changes to src\etc\lldb_commands, re-running the debuginfo tests triggers a 10-15 minute compile to, in effect, replace 1 file that's read and executed at runtime.

Might also be worth adding a CI rule to allow for using everything prebuilt and just replacing the debugger visualizer files to speed things up. That would be especially helpful since running the debuginfo test suite locally is somewhat broken.