infra: add -p to mkdir in lint steps (#17013)

Previously, if this did not find a mypy cache then it wouldnt run

this makes it always run

adding mypy ignore comments with existing uncaught issues to unblock other prs

---------

Co-authored-by: Erick Friis <erick@langchain.dev>
Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>

libs/community/tests/integration_tests/embeddings/test_baichuan.py

@@ -7,8 +7,8 @@ def test_baichuan_embedding_documents() -> None:
     documents = ["今天天气不错", "今天阳光灿烂"]
     embedding = BaichuanTextEmbeddings()
     output = embedding.embed_documents(documents)
-    assert len(output) == 2
-    assert len(output[0]) == 1024
+    assert len(output) == 2  # type: ignore[arg-type]
+    assert len(output[0]) == 1024  # type: ignore[index]
 
 
 def test_baichuan_embedding_query() -> None:
@@ -16,4 +16,4 @@ def test_baichuan_embedding_query() -> None:
     document = "所有的小学生都会学过只因兔同笼问题。"
     embedding = BaichuanTextEmbeddings()
     output = embedding.embed_query(document)
-    assert len(output) == 1024
+    assert len(output) == 1024  # type: ignore[arg-type]