test_runner: replace black with ruff format (#6268)

## Problem

`black` is slow sometimes, we can replace it with `ruff format` (a new
feature in 0.1.2 [0]), which produces pretty similar to black style [1].

On my local machine (MacBook M1 Pro 16GB):
```
# `black` on main
$ hyperfine "BLACK_CACHE_DIR=/dev/null poetry run black ."
Benchmark 1: BLACK_CACHE_DIR=/dev/null poetry run black .
  Time (mean ± σ):      3.131 s ±  0.090 s    [User: 5.194 s, System: 0.859 s]
  Range (min … max):    3.047 s …  3.354 s    10 runs
```
```
# `ruff format` on the current PR
$ hyperfine "RUFF_NO_CACHE=true poetry run ruff format"      
Benchmark 1: RUFF_NO_CACHE=true poetry run ruff format
  Time (mean ± σ):     300.7 ms ±  50.2 ms    [User: 259.5 ms, System: 76.1 ms]
  Range (min … max):   267.5 ms … 420.2 ms    10 runs
```

## Summary of changes
- Replace `black` with `ruff format` everywhere

- [0] https://docs.astral.sh/ruff/formatter/
- [1] https://docs.astral.sh/ruff/formatter/#black-compatibility

pre-commit.py

@@ -36,17 +36,17 @@ def rustfmt(fix_inplace: bool = False, no_color: bool = False) -> str:
     return cmd
 
 
-def black(fix_inplace: bool) -> str:
-    cmd = "poetry run black"
-    if not fix_inplace:
-        cmd += " --diff --check"
+def ruff_check(fix_inplace: bool) -> str:
+    cmd = "poetry run ruff check"
+    if fix_inplace:
+        cmd += " --fix"
     return cmd
 
 
-def ruff(fix_inplace: bool) -> str:
-    cmd = "poetry run ruff"
-    if fix_inplace:
-        cmd += " --fix"
+def ruff_format(fix_inplace: bool) -> str:
+    cmd = "poetry run ruff format"
+    if not fix_inplace:
+        cmd += " --diff --check"
     return cmd
 
 
@@ -109,16 +109,16 @@ if __name__ == "__main__":
         no_color=args.no_color,
     )
     check(
-        name="black",
+        name="ruff check",
         suffix=".py",
-        cmd=black(fix_inplace=args.fix_inplace),
+        cmd=ruff_check(fix_inplace=args.fix_inplace),
         changed_files=files,
         no_color=args.no_color,
     )
     check(
-        name="ruff",
+        name="ruff format",
         suffix=".py",
-        cmd=ruff(fix_inplace=args.fix_inplace),
+        cmd=ruff_format(fix_inplace=args.fix_inplace),
         changed_files=files,
         no_color=args.no_color,
     )