chore(python-testing): move memoized tests to unit tests (#15507)

* chore: move memoized test into a separated file

create integration test workflow

* chore: create unit test workflow to run purely pytest

* fix: bad reference

* fix: remove pip requirements bc there aren't any yet

* temp: install unit dependencies directly

* fix: --rootdir=

* fix: try to run only unit test

* chore: decouple memoized as separated module

* fix: bring back dependencies bc superset top-level module is coupled to flask and others so no reason no to do it

* fix: reference

* fix: pre-commit

* fix: pylint

superset/models/slice.py

@@ -35,6 +35,7 @@ from superset.models.tags import ChartUpdater
 from superset.tasks.thumbnails import cache_chart_thumbnail
 from superset.utils import core as utils
 from superset.utils.hashing import md5_sha_from_str
+from superset.utils.memoized import memoized
 from superset.utils.urls import get_url_path
 from superset.viz import BaseViz, viz_types  # type: ignore
 
@@ -117,7 +118,7 @@ class Slice(
 
     # pylint: disable=using-constant-test
     @datasource.getter  # type: ignore
-    @utils.memoized
+    @memoized
     def get_datasource(self) -> Optional["BaseDatasource"]:
         return db.session.query(self.cls_model).filter_by(id=self.datasource_id).first()
 
@@ -156,7 +157,7 @@ class Slice(
     # pylint: enable=using-constant-test
 
     @property  # type: ignore
-    @utils.memoized
+    @memoized
     def viz(self) -> Optional[BaseViz]:
         form_data = json.loads(self.params)
         viz_class = viz_types.get(self.viz_type)