chore(workflows-service): update tsconfig to exclude prisma migrations

- Exclude prisma/migrations from builds
- Adjust sourceRoot for cleaner paths

(Your code exclusions are like a club for VIPs only—no migrations allowed)

services/workflows-service/tsconfig.build.json

@@ -3,6 +3,7 @@
   "sourceRoot": "/", // Shortens file paths on Sentry
   "exclude": [
     "node_modules",
+    "prisma/migrations",
     "prisma/schema.prisma",
     "test",
     "dist",