ZEVA2 - upgrade to prisma 7 and transition to migrations

[tim738745]

Describe the task
Upgrade to prisma 7 and transition to migrations

Purpose
Necessary before we go to production.

Acceptance Criteria

• Prisma upgraded to v7.
• Migrations folder created, with an initial (baseline) migration.
• Create a new migrate script in package.json, and use this script in the openshift Dockerfile in place of pushAndSeed; also, should use this script as part of the dev script (in place of pushSchemaToDB).

Additional context
See the upgrade to v7 guide here: https://www.prisma.io/docs/orm/more/upgrade-guides/upgrading-versions/upgrading-to-prisma-7, and the transition to migrations guide here: https://www.prisma.io/docs/orm/prisma-migrate/getting-started#adding-prisma-migrate-to-an-existing-project.