David Peter d64b2f747c [ty] Add filtering option for mdtest runner (#21422) ...

## Summary

This change to the mdtest runner makes it easy to run on a subset of
tests/files. For example:

```
▶ uv run crates/ty_python_semantic/mdtest.py implicit
running 1 test
test mdtest__implicit_type_aliases ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 281 filtered out; finished in 0.83s

Ready to watch for changes...
```

Subsequent changes to either that test file or the Rust source code will
also only rerun the `implicit_type_aliases` test.

Multiple arguments can be provided, and filters can either be partial
file paths (`loops/for.md`, `loops/for`, `for`) or mangled test names
(`loops_for`):
```
▶ uv run crates/ty_python_semantic/mdtest.py implicit binary/union

running 2 tests
test mdtest__binary_unions ... ok
test mdtest__implicit_type_aliases ... ok

test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 280 filtered out; finished in 0.85s

Ready to watch for changes...
```

## Test Plan

Tested it interactively for a while

2025-11-13 12:20:31 +00:00

8.8 KiB

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