test: point to sdk-platform-java/.cloudbuild in generation IT

Author: diegomarquezp

sdk-platform-java/.cloudbuild/library_generation/cloudbuild-library-generation-integration-test.yaml

@@ -23,7 +23,7 @@ steps:
       # Use a fixed protoc version so that the generation result stays the same
       "--build-arg", "PROTOC_VERSION=25.8",
       "-t", "${_TEST_IMAGE}",
-      "-f", ".cloudbuild/library_generation/library_generation_airlock.Dockerfile",
+      "-f", "sdk-platform-java/.cloudbuild/library_generation/library_generation_airlock.Dockerfile",
       "."
   ]
   id: build-image
@@ -110,7 +110,7 @@ steps:
     source .venv/bin/activate
     pip install --require-hashes -r requirements.txt
     python -m unittest integration_tests.py
-  dir: ".cloudbuild/library_generation/scripts"
+  dir: "sdk-plaform-java/.cloudbuild/library_generation/scripts"
   id: verify-generation
   waitFor: ["generate-libraries"]
 options: