[fenix] For https://github.com/mozilla-mobile/fenix/issues/22502 - Keep the previous string resource until safe to remove

See https://github.com/mozilla-mobile/fenix/issues/20871

app/src/main/res/values/strings.xml

@@ -141,6 +141,9 @@
     <!-- Title for showing a group item in the 'Jump back in' section of the new tab
         The first parameter is the search term that the user used. (for example: your search for "cat")-->
     <string name="recent_tabs_search_term">Your search for \"%1$s\"</string>
+    <!-- Text for the number of tabs in a group in the 'Jump back in' section of the new tab
+    The first parameter is the count for number of sites in the group.  This number will always be more than one. -->
+    <string name="recent_tabs_search_term_count" moz:removedIn="96" tools:ignore="UnusedResources">Sites: %1$s</string>
     <!-- Text for the number of tabs in a group in the 'Jump back in' section of the new tab
         %d is a placeholder for the number of sites in the group. This number will always be more than one. -->
     <string name="recent_tabs_search_term_count_2">%d sites</string>