prisma: Extract to zed-extensions/prisma repository (#23961)

This PR extracts the Prisma extension to the
[zed-extensions/prisma](https://github.com/zed-extensions/prisma)
repository.

Release Notes:

- N/A

Cargo.toml

@@ -170,7 +170,6 @@ members = [
     "extensions/lua",
     "extensions/php",
     "extensions/perplexity",
-    "extensions/prisma",
     "extensions/proto",
     "extensions/purescript",
     "extensions/ruff",