Fix security dashboard project selector pagination

This commit changes a mutation within the instance level security
dashboard's project selector to correctly handle data for next-page
fetches.

ee/app/assets/javascripts/security_dashboard/store/modules/project_selector/actions.js

@@ -171,7 +171,9 @@ export const fetchSearchResultsNextPage = ({ state, dispatch, commit }) => {
   const searchOptions = { page: nextPage };
 
   return searchProjects(searchQuery, searchOptions)
-    .then(payload => commit(types.RECEIVE_SEARCH_RESULTS_SUCCESS, payload))
+    .then(payload => {
+      commit(types.RECEIVE_NEXT_PAGE_SUCCESS, payload);
+    })
     .catch(() => dispatch('receiveSearchResultsError'));
 };
 

ee/spec/frontend/security_dashboard/store/modules/project_selector/actions_spec.js

@@ -592,7 +592,7 @@ describe('EE projectSelector actions', () => {
           state,
           [
             {
-              type: types.RECEIVE_SEARCH_RESULTS_SUCCESS,
+              type: types.RECEIVE_NEXT_PAGE_SUCCESS,
               payload: { data: projects, headers: responseHeaders, pageInfo },
             },
           ],