Tests: Require GrafanaOpts when creating Grafana dir (#97825)

I don't see a reason to accept a variable amount here, as we never use it. The only use I can see is optionally
including the opts, which isn't necessary and only complicates matters when an empty struct would do just as well: the
options are all created to be assumed zero-values already, in case a test doesn't need that option set.

pkg/tests/web/index_view_test.go

@@ -47,7 +47,9 @@ func TestIntegrationIndexView(t *testing.T) {
 	})
 
 	t.Run("CSP disabled", func(t *testing.T) {
-		grafDir, cfgPath := testinfra.CreateGrafDir(t)
+		grafDir, cfgPath := testinfra.CreateGrafDir(t, testinfra.GrafanaOpts{
+			EnableCSP: false,
+		})
 		addr, _ := testinfra.StartGrafana(t, grafDir, cfgPath)
 
 		// nolint:bodyclose