Fix a lot of test related typing issues

scripts/memory_check.py

@@ -13,7 +13,7 @@ Note: This requires the psutil library, available on PyPI.
 import time
 import sys
 import os
-import psutil
+import psutil  # type: ignore[import-untyped]
 sys.path.insert(0, os.path.abspath(os.path.dirname(__file__) + '/..'))
 import jedi