chore: tests for "disable integrations" changes

The "disable integrations" feature allows disabling integrations by
changing the "ToolchainConfig" resource. The goal of this test is to
verify that the CRD key is there, and that it is empty, since the E2E
tests should not have any integrations disabled.

SANDBOX-1769

Author: MikelAlejoBR

test/e2e/parallel/registration_service_test.go

@@ -1015,6 +1015,11 @@ func TestUIConfig(t *testing.T) {
 		workatoWebHookURL, ok := response["workatoWebHookURL"].(string)
 		require.True(t, ok)
 		assert.Equal(t, "https://webhooks.testwebhook", workatoWebHookURL)
+
+		// verify that disabledIntegrations is present and is an array
+		disabledIntegrations, ok := response["disabledIntegrations"]
+		require.True(t, ok, "disabledIntegrations field should be present in uiconfig response")
+		require.IsType(t, []interface{}{}, disabledIntegrations, "disabledIntegrations should be an array")
 	})
 }