Replace markdown-it-py with small function in common/ (#32664)

* Replace markdown-it-py with small function in common/

* simple test

* unused

* lock

* linting fixes
old-commit-hash: 5265d13fe0

common/tests/test_markdown.py

@@ -0,0 +1,15 @@
+import os
+
+from openpilot.common.basedir import BASEDIR
+from openpilot.common.markdown import parse_markdown
+
+
+class TestMarkdown:
+  def test_all_release_notes(self):
+    with open(os.path.join(BASEDIR, "RELEASES.md")) as f:
+      release_notes = f.read().split("\n\n")
+      assert len(release_notes) > 10
+
+      for rn in release_notes:
+        md = parse_markdown(rn)
+        assert len(md) > 0