fix(orchestrator): add prisma CLI as devDependency for prisma:generate script

The prisma:generate script added in #703 calls 'prisma generate' but the
prisma CLI was not installed in the orchestrator package. Adding it as a
devDependency so pnpm can resolve it during the monorepo build step.

pnpm-lock.yaml

@@ -389,6 +389,9 @@ importers:
       '@vitest/coverage-v8':
         specifier: ^4.0.18
         version: 4.0.18([email protected](@opentelemetry/[email protected])(@types/[email protected])([email protected])([email protected])([email protected])([email protected])([email protected]))
+      prisma:
+        specifier: ^6.19.2
+        version: 6.19.2([email protected])([email protected])
       ts-node:
         specifier: ^10.9.2
         version: 10.9.2(@swc/[email protected])(@types/[email protected])([email protected])