[ci] Scope local pylint pre-commit hook to esphome/ to match CI

The ``pylint`` CI job runs ``pylint esphome`` — esphome/ only. The
local pre-commit hook had no ``files:`` restriction, so it also
linted ``tests/``, flagging pre-existing protected-access usage and
class-size issues that CI never sees. That blocked local commits on
warnings CI doesn't gate on.

Add ``files: ^esphome/.+\\.py$`` to the local pylint hook so its scope
matches the CI job exactly.

.pre-commit-config.yaml

@@ -58,6 +58,7 @@ repos:
         entry: python3 script/run-in-env.py pylint
         language: system
         types: [python]
+        files: ^esphome/.+\.py$
       - id: clang-tidy-hash
         name: Update clang-tidy hash
         entry: python script/clang_tidy_hash.py --update-if-changed