tests:linting - add test script to run black and ruff locally

It is not run by pytest unless called explicitly due to the filename not starting with test_

tests/linting.py

@@ -0,0 +1,18 @@
+import subprocess
+from pathlib import Path
+
+
+def test_black(test_folder: Path):
+    completed_process = subprocess.run(
+        ["poetry", "run", "black", "--check", str(test_folder.parent)],
+        check=False,
+    )
+    assert completed_process.returncode == 0
+
+
+def test_ruff(test_folder: Path):
+    completed_process = subprocess.run(
+        ["poetry", "run", "ruff", "check", str(test_folder.parent)],
+        check=False,
+    )
+    assert completed_process.returncode == 0