unify pre-commit mypy and ci mypy (#13940)

pyproject.toml

@@ -135,9 +135,14 @@ check_untyped_defs = true
 explicit_package_bases = true
 warn_unreachable = true
 warn_redundant_casts = true
+strict_equality = true
 # NOTE: had to comment this out to make mypy pass on both CI and OSX
 #warn_unused_ignores = true
 
+[[tool.mypy.overrides]]
+module = "extra.*"
+follow_imports = "skip"
+
 [tool.pytest.ini_options]
 norecursedirs = [
   "extra",