fix: Make seeding happen only once for Cypress in Github Actions

[na2hiro]

Currently Cypress task for the deploy Github Action runs them in a row:

• npx prisma migrate reset --force
• npx prisma db seed

Because prisma migrate reset also runs seed command, it could fail if the seed script inserts with unique keys specified for example:

We should remove explicit npx prisma db seed there so seed runs only once.

[kentcdodds]

Thanks!