chore: tidy code and extract alert-dialog

packages/lib/server-only/user/service-accounts/deleted-account.ts

@@ -0,0 +1,17 @@
+import { prisma } from '@documenso/prisma';
+
+export const deletedAccountServiceAccount = async () => {
+  const serviceAccount = await prisma.user.findFirst({
+    where: {
+      email: 'deleted-account@documenso.com',
+    },
+  });
+
+  if (!serviceAccount) {
+    throw new Error(
+      'Deleted account service account not found, have you ran the appropriate migrations?',
+    );
+  }
+
+  return serviceAccount;
+};