fix(auth): exclude test files from tsc compilation

Exclude src/__tests__ from tsconfig to prevent test files from being
compiled during Docker build. Fixes build-and-push-auth CI failure.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

auth/tsconfig.json

@@ -12,5 +12,5 @@
     "resolveJsonModule": true
   },
   "include": ["src"],
-  "exclude": ["node_modules", "dist"]
+  "exclude": ["node_modules", "dist", "src/__tests__"]
 }