Merge branch 'psi-wi-missing-namesapce' into 'master'

Fix missing/incorrect linked work items from other namespaces

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/160181



Merged-by: Deepika Guliani <dguliani@gitlab.com>
Approved-by: Deepika Guliani <dguliani@gitlab.com>
Approved-by: Rajan Mistry <rmistry@gitlab.com>
Co-authored-by: Simon Knox <simon@gitlab.com>

app/assets/javascripts/work_items/graphql/work_item_hierarchy.fragment.graphql

@@ -40,6 +40,11 @@ fragment WorkItemHierarchy on WorkItem {
             name
             iconName
           }
+          namespace {
+            id
+            fullPath
+            name
+          }
           title
           state
           createdAt

spec/frontend/work_items/mock_data.js

@@ -1846,6 +1846,12 @@ export const mockHierarchyChildren = [
       iconName: 'issue-type-objective',
       __typename: 'WorkItemType',
     },
+    namespace: {
+      __typename: 'Project',
+      id: '1',
+      fullPath: 'test-objective-project-path',
+      name: 'Project name',
+    },
     title: 'Objective 2',
     state: 'OPEN',
     confidential: false,