Enable Ruff flake8-use-pathlib (PTH) (#13795)

Port existing code to pathlib

pyproject.toml

@@ -54,6 +54,7 @@ select = [
     "PGH", # pygrep-hooks
     "PIE", # flake8-pie
     "PL", # Pylint
+    "PTH", # flake8-use-pathlib
     "RSE", # flake8-raise
     "RUF", # Ruff-specific and unused-noqa
     "SLOT", # flake8-slots
@@ -80,9 +81,6 @@ select = [
     "FURB187", # Use of assignment of `reversed` on list `{name}`
     # Used for lint.flake8-import-conventions.aliases
     "ICN001", # `{name}` should be imported as `{asname}`
-    # Autofixable flake8-use-pathlib only
-    "PTH201", # Do not pass the current directory explicitly to `Path`
-    "PTH210", # Invalid suffix passed to `.with_suffix()`
     # PYI: only enable rules that have autofixes and that we always want to fix (even manually),
     # avoids duplicate # noqa with flake8-pyi
     "PYI009", # Empty body should contain `...`, not pass
@@ -167,6 +165,8 @@ ignore = [
     "PLR2004", # Magic value used in comparison, consider replacing `{value}` with a constant variable
     # Keep codeflow path separation explicit
     "PLR5501", # Use `elif` instead of `else` then `if`, to reduce indentation
+    # Often just leads to redundant more verbose code when needing an actual str
+    "PTH208", # Use `pathlib.Path.iterdir()` instead.
     # Allow FIXME
     "TD001", # Invalid TODO tag: `{tag}`
     # Git blame is sufficient