Include py.typed in MANIFEST.in (#5703)

This enables packages that install dbt-core from pypi to use mypy.

core/dbt/config/profile.py

@@ -91,7 +91,6 @@ class Profile(HasCredentials):
     threads: int
     credentials: Credentials
     profile_env_vars: Dict[str, Any]
-    manage_schemas: Optional[bool]
 
     def __init__(
         self,

tests/functional/schema_management/test_drop_dangling_models.py

@@ -0,0 +1,77 @@
+import pytest
+import os
+
+from dbt.tests.util import (
+    run_dbt,
+    check_table_does_exist,
+    check_table_does_not_exist,
+)
+
+model = """
+{{
+  config(
+    materialized = "table"
+  )
+}}
+SELECT * FROM (
+VALUES (1, 'one'),
+ (2, 'two'),
+ (3, 'three')
+) AS t (num,letter)
+"""
+
+
+
+class TestDanglingModels:
+
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "model_a.sql": model,
+            "model_b.sql": model,
+        }
+
+
+    @pytest.fixture(scope="class")
+    def dbt_profile_target(self):
+        return {
+            "type": "postgres",
+            "threads": 4,
+            "host": "localhost",
+            "port": int(os.getenv("POSTGRES_TEST_PORT", 5432)),
+            "user": os.getenv("POSTGRES_TEST_USER", "root"),
+            "pass": os.getenv("POSTGRES_TEST_PASS", "password"),
+            "dbname": os.getenv("POSTGRES_TEST_DATABASE", "dbt"),
+            "manage_schemas": True,
+        }
+
+    @pytest.fixture(scope="class")
+    def project_config_update(self, unique_schema):
+        return {
+            "managed-schemas": [
+                {
+                    "database": os.getenv("POSTGRES_TEST_DATABASE", "dbt"),
+                    "schema": unique_schema,
+                    "action": "drop",
+                }
+            ]
+        }
+
+
+    def test_drop(
+        self,
+        project,
+    ):
+        # create numbers model
+        run_dbt(["run"])
+        check_table_does_exist(project.adapter, "model_a")
+        check_table_does_exist(project.adapter, "model_b")
+        check_table_does_not_exist(project.adapter, "baz")
+
+        # remove numbers model
+        project.update_models({
+            "model_b.sql": model,
+        })
+        run_dbt(["run"])
+        check_table_does_not_exist(project.adapter, "model_a")
+        check_table_does_exist(project.adapter, "model_b")