SOLR-18399: Ship ui-grid icon fonts with the Admin UI

solr/webapp/src/test/org/apache/solr/webapp/AdminUiTestBase.java

@@ -534,9 +534,6 @@ protected static void assertNoSevereConsoleErrors(String... allowedSubstrings) {
                     Arrays.stream(allowedSubstrings)
                         .noneMatch(allowed -> entry.getMessage().contains(allowed)))
             .filter(entry -> !entry.getMessage().contains("favicon.ico"))
-            // the ui-grid icon font referenced from ui-grid.min.css is not shipped with
-            // the webapp at all, so it 404s in production too
-            .filter(entry -> !entry.getMessage().contains("fonts/ui-grid"))
             // benign race in the shared menu code: showCore() fires with a null core
             // while the per-collection menu resolves after navigation
             .filter(