Add license and Fix IDE warnings (#11985)

### What problem does this PR solve?

- Add license
- Fix IDE warnings

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

common/data_source/google_drive/connector.py

@@ -1210,7 +1210,7 @@ if __name__ == "__main__":
         creds = get_credentials_from_env(email, oauth=True)
         print("Credentials loaded successfully")
         print(f"{creds=}")
-        sys.exit(0)
+        # sys.exit(0)
         connector = GoogleDriveConnector(
             include_shared_drives=False,
             shared_drive_urls=None,

common/data_source/google_drive/file_retrieval.py

@@ -341,6 +341,6 @@ def get_all_files_for_oauth(
 
 # Just in case we need to get the root folder id
 def get_root_folder_id(service: Resource) -> str:
-    # we dont paginate here because there is only one root folder per user
+    # we don't paginate here because there is only one root folder per user
     # https://developers.google.com/drive/api/guides/v2-to-v3-reference
     return service.files().get(fileId="root", fields=GoogleFields.ID.value).execute()[GoogleFields.ID.value]