config: remove unneeded lazy imports

And a couple of minor cleanups.

Author: bluetech

src/_pytest/config/__init__.py

@@ -1041,9 +1041,6 @@ def __init__(
         *,
         invocation_params: InvocationParams | None = None,
     ) -> None:
-        from .argparsing import FILE_OR_DIR
-        from .argparsing import Parser
-
         if invocation_params is None:
             invocation_params = self.InvocationParams(
                 args=(), plugins=None, dir=pathlib.Path.cwd()
@@ -1061,9 +1058,8 @@ def __init__(
         :type: InvocationParams
         """
 
-        _a = FILE_OR_DIR
         self._parser = Parser(
-            usage=f"%(prog)s [options] [{_a}] [{_a}] [...]",
+            usage=f"%(prog)s [options] [{FILE_OR_DIR}] [{FILE_OR_DIR}] [...]",
             processopt=self._processopt,
             _ispytest=True,
         )

src/_pytest/config/argparsing.py

@@ -12,8 +12,8 @@
 from typing import Literal
 from typing import NoReturn
 
+from .exceptions import UsageError
 import _pytest._io
-from _pytest.config.exceptions import UsageError
 from _pytest.deprecated import check_ispytest