[Profiling] Rename lastprocessed into next_time in profiling-executables index template (elastic#96356)

Author: rockdaboot

x-pack/plugin/core/src/main/resources/org/elasticsearch/xpack/profiler/component-template/profiling-executables.json

@@ -28,7 +28,7 @@
           "type": "date",
           "format": "epoch_second"
         },
-        "Symbolization.lastprocessed": {
+        "Symbolization.next_time": {
           "type": "date",
           "format": "epoch_second",
           "index": false