Get list of update set types (ServiceNowDevProgram#1485)

* Create Get list of Update Set types

This snippet outputs a list of module types included in an update set.
By checking the included module types before committing an update set, you can be sure you aren't including any unintended updates.

* Delete Background Scripts/Get list of Update Set types

* Get a list of Update Set types

This snippet outputs a list of module types included in an update set.
By checking the included module types before committing an update set, you can be sure you aren't including any unintended updates.

* Create README.md

Author: mioyokohama

Background Scripts/Get list of Update Set types/README.md

@@ -0,0 +1,2 @@
+This snippet outputs a list of module types included in an update set.
+By checking the included module types before committing an update set, you can be sure you aren't including any unintended updates.

Background Scripts/Get list of Update Set types/script.js

@@ -0,0 +1,13 @@
+function getListOfUpdateSetTypes(update_set){
+    var result = []
+    var gr = new GlideAggregate('sys_update_xml');
+    gr.addQuery('update_set', update_set);
+    gr.groupBy('type');
+    gr.query();
+    while(gr.next()){
+        result.push(gr.type.getDisplayValue())
+    }
+    return result;
+}
+
+getListOfUpdateSetTypes('update_set_sys_id');