fix: remove top-level (monorepo) package.json from Dockerfile (#3532)

Author: hassy

packages/artillery/lib/platform/aws-ecs/worker/Dockerfile

@@ -54,6 +54,7 @@ RUN npm install -w artillery --ignore-scripts --omit=dev
 RUN npm install aws-lambda-ric
 
 RUN npm cache clean --force \
+    && rm ./package.json \
     && rm -rf /root/.cache \
     && ln -s /artillery/node_modules/.bin/artillery /usr/local/bin/artillery \
     && rm -rf /ms-playwright/firefox* \