Partner data sources smoke tests (#98446)

* Add smoke tests for remaining partner data sources

* Fix test names and run them

* Use text check for gcm

e2e/plugin-e2e/graphite/graphite.spec.ts

@@ -0,0 +1,8 @@
+import { test, expect } from '@grafana/plugin-e2e';
+
+test('Smoke test: decoupled frontend plugin loads', async ({ createDataSourceConfigPage, page }) => {
+  await createDataSourceConfigPage({ type: 'graphite' });
+
+  await expect(await page.getByText('Type: Graphite', { exact: true })).toBeVisible();
+  await expect(await page.getByRole('heading', { name: 'HTTP', exact: true })).toBeVisible();
+});