fix: s3 upload issue

Author: phani-srikar

.codebuild/run_ios_modelgen_e2e_test.yml

@@ -13,6 +13,11 @@ phases:
       - source ./shared-scripts.sh && _setupE2ETestsLinux
       - codebuild-breakpoint
       - source ./shared-scripts.sh && _runE2ETestsLinux
+      - unset AWS_ACCESS_KEY_ID
+      - unset AWS_SECRET_ACCESS_KEY
+      - unset AWS_SESSION_TOKEN
+      - aws sts get-caller-identity
+      - codebuild-breakpoint
       - export PATH_TO_MODELS=$CODEBUILD_SRC_DIR/packages/amplify-codegen-e2e-tests/test-apps/swift/amplify/generated
       - cd $PATH_TO_MODELS && zip -r models.zip models
       - aws s3 cp $PATH_TO_MODELS/models.zip s3://$ARTIFACT_BUCKET_NAME/models.zip