Create a test using pnpm with deployment to vercel

[AhmedElywa]

We got an issue #189. At this issue the nexus-prisma generated code try to import @prisma/client from path not found.
the issue was because using pnpm package manager creating his own paths to the npm packages.
The fix we did was looking into the @prisma/client output path and if we found it's into the .pnpm folder we will use the direct import @prisma/client

But now we not have an way to test if this fix working or now. We need to add an test to test the pnpm with vercel

[AhmedElywa]

I did a live test and it's working now good https://nexus-full-test.vercel.app