Only generate the prisma client if it's not found

[itsdillon]

Closes: #3801

What are the changes and their implications?

Only generate the prisma client if it's not found. It checks for both @prisma/client and .prisma.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 6185f2ee31b93d120377d05d064d4d2e8d5f4115

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages

Name	Type
blitz	Patch
@blitzjs/auth	Patch
@blitzjs/next	Patch
@blitzjs/rpc	Patch
@blitzjs/codemod	Patch
@blitzjs/config	Patch
@blitzjs/generator	Patch

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