Fix prisma migrate cli regression error

[marekryb]

PR #8790 among many things replaced execa with execFile as a way to spawn child process for prisma cli commands.

Unfortunately execFile does not allow inheriting stdin from parent process like before

keystone/packages/core/src/scripts/prisma.ts

Line 27 in f92aa40

stdio: 'inherit',

Prisma commands that require user input (eg. prisma migrate dev or prisma migrate reset) now throw Error: Prisma Migrate has detected that the environment is non-interactive, which is not supported. and there is no flag or option to turn it off (prisma/prisma#4669 prisma/prisma#7113)

Related issues: #8888 #8858

There are at least 3 ways to fix this issue:

1. Revert code to old version (execa)
2. Switch to execFileSync
3. Switch to spawn

I chose the last one. In my limited testing everything seems to work fine. Let me know if other way is preferred instead.

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[dcousens]

Thanks for this @marekryb, I'm wondering what we can do to ensure tests capture this regression