CI: Let the Python formatters and linters apply to all files in the collection (#11385)

Let the Python formatters and linters apply to all files in the collection.

antsibull-nox.toml

@@ -20,6 +20,7 @@ stable_branches = [ "stable-*" ]
 [sessions]
 
 [sessions.lint]
+code_files = ["."]  # consider all Python files in the collection
 run_isort = false
 run_black = false
 run_ruff_check = true

ruff.toml

@@ -4,9 +4,6 @@
 
 line-length = 120
 
-# Include only the files:
-include = ["plugins/**/*.py", "tests/unit/**/*.py", "noxfile.py"]
-
 [lint]
 # https://docs.astral.sh/ruff/rules/