Adds infotips for Work Items WIG (#2266)

Author: Preeticp

controller/test-files/work_item_type_group/list/ok_agile_template.payload.golden.json

@@ -4,6 +4,7 @@
       "attributes": {
         "bucket": "portfolio",
         "created-at": "0001-01-01T00:00:00Z",
+        "description": "Work items describe and keep track of work that needs to be completed. They can be assigned to collaborators within a space. It comprises the agile work item types such as themes, epics, stories, tasks, defects and impediments.",
         "icon": "fa fa-bullseye",
         "name": "Work Items",
         "show-in-sidebar": true,

spacetemplate/assets/agile.yaml

@@ -427,6 +427,10 @@ work_item_type_groups:
   - *defectID
   - *impedimentID
   bucket: portfolio
+  description:
+    Work items describe and keep track of work that needs to be completed. They
+    can be assigned to collaborators within a space. It comprises the agile work
+    item types such as themes, epics, stories, tasks, defects and impediments.
   icon: fa fa-bullseye
 
 - name: Execution