Fix the project ID query param

Fix the query param for the project IDs array
so that the endpoint path is valid.

Also removed including subgroups since it
is making the list of projects confusing. You
can view the same page in a subgroup, so
no functionality is being lost.

ee/app/assets/javascripts/analytics/repository_analytics/components/group_repository_analytics.vue

@@ -79,7 +79,7 @@ export default {
 
       // not including a project_ids param is the same as selecting all the projects
       if (!this.selectAllProjects) {
-        queryParams.set('project_ids', this.selectedProjectIdsParam);
+        this.selectedProjectIds.forEach(id => queryParams.append('project_ids[]', id));
       }
 
       return `${this.groupAnalyticsCoverageReportsPath}&${queryParams.toString()}`;
@@ -105,7 +105,7 @@ export default {
         project.name.toLowerCase().includes(this.projectSearchTerm.toLowerCase()),
       );
     },
-    selectedProjectIdsParam() {
+    selectedProjectIds() {
       return this.groupProjects.filter(project => project.isSelected).map(project => project.id);
     },
   },

ee/app/assets/javascripts/analytics/repository_analytics/graphql/queries/get_group_projects.query.graphql

 query getGroupProjects($groupFullPath: ID!) {
   group(fullPath: $groupFullPath) {
-    projects(includeSubgroups: true) {
+    projects {
       nodes {
         name
         id

ee/changelogs/unreleased/254308-fix-query-params-for-test-coverage-report.yml

+---
+title: Fix project_ids query param for group test coverage report
+merge_request: 42880
+author:
+type: fixed

ee/spec/frontend/analytics/repository_analytics/components/group_repository_analytics_spec.js

@@ -89,7 +89,8 @@ describe('Group repository analytics app', () => {
         });
 
         it('renders primary action as a link with two project IDs as parameters', () => {
-          const expectedPath = `${groupAnalyticsCoverageReportsPathWithDates}&project_ids=${groupProjectsData[0].id}%2C${groupProjectsData[1].id}`;
+          const projectIdsQueryParam = `project_ids%5B%5D=${groupProjectsData[0].id}&project_ids%5B%5D=${groupProjectsData[1].id}`;
+          const expectedPath = `${groupAnalyticsCoverageReportsPathWithDates}&${projectIdsQueryParam}`;
 
           expect(findCodeCoverageDownloadButton().attributes('href')).toBe(expectedPath);
         });
@@ -101,7 +102,8 @@ describe('Group repository analytics app', () => {
         });
 
         it('renders primary action as a link with one project ID as a parameter', () => {
-          const expectedPath = `${groupAnalyticsCoverageReportsPathWithDates}&project_ids=${groupProjectsData[0].id}`;
+          const projectIdsQueryParam = `project_ids%5B%5D=${groupProjectsData[0].id}`;
+          const expectedPath = `${groupAnalyticsCoverageReportsPathWithDates}&${projectIdsQueryParam}`;
 
           expect(findCodeCoverageDownloadButton().attributes('href')).toBe(expectedPath);
         });