Change incidents list query to search by issue_type

app/assets/javascripts/incidents/components/incidents_list.vue

@@ -92,7 +92,7 @@ export default {
           searchTerm: this.searchTerm,
           state: this.stateFilter,
           projectPath: this.projectPath,
-          labelNames: ['incident'],
+          issueTypes: ['INCIDENT'],
           firstPageSize: this.pagination.firstPageSize,
           lastPageSize: this.pagination.lastPageSize,
           prevPageCursor: this.pagination.prevPageCursor,

app/assets/javascripts/incidents/graphql/queries/get_incidents.query.graphql

 query getIncidents(
   $projectPath: ID!
-  $labelNames: [String]
+  $issueTypes: [IssueType!]
   $state: IssuableState
   $firstPageSize: Int
   $lastPageSize: Int
@@ -12,7 +12,7 @@ query getIncidents(
     issues(
       search: $searchTerm
       state: $state
-      labelName: $labelNames
+      types: $issueTypes
       first: $firstPageSize
       last: $lastPageSize
       after: $nextPageCursor