Revert "Mute FsSearchableSnapshotsIT testClearCache (#58902)"

The test was fixed in #58847

This reverts commit f5c78475047a473dc0d04a67fadcb31e8216ce18.

x-pack/plugin/searchable-snapshots/src/test/java/org/elasticsearch/xpack/searchablesnapshots/AbstractSearchableSnapshotsRestTestCase.java

@@ -170,7 +170,6 @@ public abstract class AbstractSearchableSnapshotsRestTestCase extends ESRestTest
         });
     }
 
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/58901")
     public void testClearCache() throws Exception {
         @SuppressWarnings("unchecked")
         final Function<Map<?, ?>, Long> sumCachedBytesWritten = stats -> stats.values()