fix(chart-unfurls): Fix unfurls with top events (#29119)

Chart unfurls are currently broken when top
events when they are passed in with events
with non-top event display types.

src/sentry/integrations/slack/unfurl/discover.py

@@ -95,6 +95,7 @@ def unfurl_discover(
 
         if "daily" in display_mode:
             params.setlist("interval", ["1d"])
+
         if "top5" in display_mode:
             if features.has("organizations:discover-top-events", org):
                 params.setlist(
@@ -104,6 +105,10 @@ def unfurl_discover(
                 )
             else:
                 params.setlist("topEvents", [f"{TOP_N}"])
+        else:
+            # topEvents param persists in the URL in some cases, we want to discard
+            # it if it's not a top n display type.
+            params.pop("topEvents", None)
 
         try:
             resp = client.get(