feat(server): new email template (#9528)

use `yarn af server dev:mail` to preview all mail template
fix CLOUD-93

packages/backend/server/src/mails/common.ts

@@ -0,0 +1,10 @@
+import { UserProps } from './components';
+import { WorkspaceProps } from './components/workspace';
+
+export const TEST_USER: UserProps = {
+  email: 'test@test.com',
+};
+
+export const TEST_WORKSPACE: WorkspaceProps = {
+  name: 'Test Workspace',
+};