fix(issue-stream): Fix issue stream reloading after initial load (#41283)

The issue is that the component was checking referential equality for
the selected saved search, which was being modified in
`useSelectedSavedSearch` (to change the name to "My Default Search").

I made two changes - a `useMemo` to avoid making a new savedSearch
object on each render, and avoided a referential check in `overview.tsx`
by checking for differing query/sort on the saved search instead.

static/app/views/issueList/overview.tsx

@@ -247,7 +247,8 @@ class IssueListOverview extends Component<Props, State> {
       prevQuery.query !== newQuery.query ||
       prevQuery.statsPeriod !== newQuery.statsPeriod ||
       prevQuery.groupStatsPeriod !== newQuery.groupStatsPeriod ||
-      prevProps.savedSearch !== this.props.savedSearch
+      prevProps.savedSearch?.query !== this.props.savedSearch?.query ||
+      prevProps.savedSearch?.sort !== this.props.savedSearch?.sort
     ) {
       this.fetchData(selectionChanged);
     } else if (

static/app/views/issueList/utils/useSelectedSavedSearch.tsx

@@ -1,3 +1,4 @@
+import {useMemo} from 'react';
 import isNil from 'lodash/isNil';
 
 import {t} from 'sentry/locale';
@@ -30,10 +31,14 @@ export const useSelectedSavedSearch = (): SavedSearch | null => {
       ? savedSearches?.find(search => search.isPinned)
       : savedSearches?.find(({id}) => id === selectedSearchId);
 
-  return selectedSavedSearch?.isPinned
-    ? {
-        ...selectedSavedSearch,
-        name: PINNED_SEARCH_NAME,
-      }
-    : selectedSavedSearch ?? null;
+  return useMemo(
+    () =>
+      selectedSavedSearch?.isPinned
+        ? {
+            ...selectedSavedSearch,
+            name: PINNED_SEARCH_NAME,
+          }
+        : selectedSavedSearch ?? null,
+    [selectedSavedSearch]
+  );
 };