small linear connector improvements (#3929)

* small linear connector improvements

* add todo for url handling

backend/onyx/connectors/linear/connector.py

@@ -91,6 +91,7 @@ class LinearConnector(LoadConnector, PollConnector, OAuthConnector):
             f"&response_type=code"
             f"&scope=read"
             f"&state={state}"
+            f"&prompt=consent"  # prompts user for access; allows choosing workspace
         )
 
     @classmethod

backend/onyx/server/documents/standard_oauth.py

@@ -179,12 +179,10 @@ def oauth_callback(
         db_session=db_session,
     )
 
+    # TODO: use a library for url handling
+    sep = "&" if "?" in desired_return_url else "?"
     return CallbackResponse(
-        redirect_url=(
-            f"{desired_return_url}?credentialId={credential.id}"
-            if "?" not in desired_return_url
-            else f"{desired_return_url}&credentialId={credential.id}"
-        )
+        redirect_url=f"{desired_return_url}{sep}credentialId={credential.id}"
     )