ref(node)!: Remove deprecated prismaInstrumentation option (#22898)

Removes the deprecated `prismaInstrumentation` option. Already
documented in the v11 migration guide.

Fixes #21838

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: nicohrubec

packages/server-utils/src/prisma/index.ts

@@ -14,10 +14,6 @@ export interface PrismaInstrumentationConfig {
 }
 
 export interface PrismaOptions {
-  /**
-   * @deprecated This is no longer used, v5 works out of the box.
-   */
-  prismaInstrumentation?: unknown;
   /**
    * Configuration for the Prisma tracing helper.
    */