Add deprecation warning

Author: krishnan-chandra

src/python/pants/backend/experimental/python/lint/ruff/register.py

@@ -6,8 +6,14 @@
 See https://www.pantsbuild.org/docs/python-linters-and-formatters and https://docs.astral.sh/ruff/
 """
 
+from pants.base.deprecated import warn_or_error
 from pants.backend.experimental.python.lint.ruff.check import register as ruff_check_rules
 
 
 def rules():
+    warn_or_error(
+        "2.22.0",
+        "using the `pants.backend.experimental.python.lint.ruff` backend",
+        hint="Use `pants.backend.experimental.python.lint.ruff.check` instead.",
+    )
     return ruff_check_rules.rules()