CI: prepare for pytest by adding marker and avoiding duplicated tests (#29682)

prepare for pytest
old-commit-hash: d3befb2e04

pyproject.toml

@@ -1,8 +1,11 @@
 [tool.pytest.ini_options]
 minversion = "6.0"
-addopts = "--ignore=opendbc/ --ignore=panda/ --ignore=rednose_repo/ --ignore=tinygrad_repo/ --ignore=laika_repo/ -Werror --strict-config --strict-markers"
+addopts = "--ignore=openpilot/ --ignore=opendbc/ --ignore=panda/ --ignore=rednose_repo/ --ignore=tinygrad_repo/ --ignore=laika_repo/ -Werror --strict-config --strict-markers"
 python_files = "test_*.py"
 #timeout = "30"  # you get this long by default
+markers = [
+  "parallel: mark tests as parallelizable (tests with no global state, so can be run in parallel)"
+]
 
 [tool.mypy]
 python_version = "3.11"