augment login telemetry event (#6569)

* augment login telemetry event

the uuid already provided this info, but in a less useful way

* avoid $set if values are empty

Author: masenf

reflex/reflex.py

@@ -604,7 +604,18 @@ def login():
         _skip_compile()  # Allow running outside of an app dir
         from reflex.utils import telemetry
 
-        telemetry.send("login", user_uuid=user_uuid)
+        set_props = {}
+        if user_email := validated_info.get("email"):
+            set_props["email"] = user_email
+        if user_tier := validated_info.get("tier"):
+            set_props["tier"] = user_tier
+        telemetry.send(
+            "login",
+            properties={
+                "$set": set_props,
+                "user_uuid": user_uuid,
+            },
+        )
 
 
 @cli.command()