[feat] Detect missing formatting args when the string is not interpolated too

The original decision was taken in db8b3a4 during implementation with
a different rational ("If no args were supplied, then all format strings
are valid don't check any further.") and was not discussed again when the
comment was updated in #2713. I think the new behavior make sense especially
considering that the primer shows 4 false negative in home-assistant.

Co-authored by: Alex Prabhat Bara <[email protected]>

Author: Pierre-Sassoulas

doc/whatsnew/fragments/9999.false_negative

@@ -0,0 +1,4 @@
+We now raise a ``logging-too-few-args`` when there's no interpolation at all (i.e. ``logging.debug("Awaiting process %s")``).
+Previously we did not raise for such case (voluntarily).
+
+Closes #9999

pylint/checkers/logging.py

@@ -326,11 +326,6 @@ def _check_format_string(self, node: nodes.Call, format_arg: Literal[0, 1]) -> N
           format_arg: Index of the format string in the node arguments.
         """
         num_args = _count_supplied_tokens(node.args[format_arg + 1 :])
-        if not num_args:
-            # If no args were supplied the string is not interpolated and can contain
-            # formatting characters - it's used verbatim. Don't check any further.
-            return
-
         format_string = node.args[format_arg].value
         required_num_args = 0
         if isinstance(format_string, bytes):