Remove process.cwd change for Prisma in tests

[borisno2]

In the Admin UI and Smoke Test utils we where changing process.cwd to the projectDir.

Following #8307, this should no longer be required.
This pull request removes the process.cwd mutations.

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Latest commit: 81bb1d6

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Name	Status	Preview	Comments	Updated
keystone-next-docs	⬜️ Ignored (Inspect)			Feb 28, 2023 at 0:42AM (UTC)

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