Prometheus: Add resource for suggestions that include scopes/adhoc filters (#94001)

Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>
Co-authored-by: Bogdan Matei <bogdan.matei@grafana.com>

e2e/plugin-e2e/plugin-e2e-api-tests/as-admin-user/variableEditPage.spec.ts

@@ -5,6 +5,7 @@ import { prometheusLabels } from '../mocks/resources';
 
 test('variable query with mocked response', async ({ variableEditPage, page }) => {
   variableEditPage.mockResourceResponse('api/v1/labels?*', prometheusLabels);
+  variableEditPage.mockResourceResponse('suggestions*', prometheusLabels);
   await variableEditPage.datasource.set('gdev-prometheus');
   await variableEditPage.getByGrafanaSelector('Query type').fill('Label names');
   await page.keyboard.press('Tab');