Fix assumption in TimeSeriesIT (elastic#106448)

This should be an assumption instead of an assertion.

Closes elastic#106444

x-pack/plugin/esql/src/internalClusterTest/java/org/elasticsearch/xpack/esql/action/TimeSeriesIT.java

@@ -16,13 +16,12 @@ public class TimeSeriesIT extends AbstractEsqlIntegTestCase {
 
     @Override
     protected EsqlQueryResponse run(EsqlQueryRequest request) {
-        assertTrue("timseries requires pragmas", canUseQueryPragmas());
+        assumeTrue("timseries requires pragmas", canUseQueryPragmas());
         var settings = Settings.builder().put(request.pragmas().getSettings()).put(QueryPragmas.TIME_SERIES_MODE.getKey(), "true").build();
         request.pragmas(new QueryPragmas(settings));
         return super.run(request);
     }
 
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/106444")
     public void testEmpty() {
         Settings settings = Settings.builder().put("mode", "time_series").putList("routing_path", List.of("pod")).build();
         client().admin()