chore: clear NPM cache of Docker image (#27000)

utils/docker/Dockerfile.focal

@@ -40,4 +40,5 @@ RUN mkdir /ms-playwright && \
     npm exec --no -- playwright-core mark-docker-image "${DOCKER_IMAGE_NAME_TEMPLATE}" && \
     npm exec --no -- playwright-core install --with-deps && rm -rf /var/lib/apt/lists/* && \
     rm /tmp/playwright-core.tar.gz && \
+    rm -rf ~/.npm/ && \
     chmod -R 777 /ms-playwright

utils/docker/Dockerfile.jammy

@@ -39,4 +39,5 @@ RUN mkdir /ms-playwright && \
     npm exec --no -- playwright-core install --with-deps && rm -rf /var/lib/apt/lists/* && \
     rm /tmp/playwright-core.tar.gz && \
     rm -rf /ms-playwright-agent && \
+    rm -rf ~/.npm/ && \
     chmod -R 777 /ms-playwright