ci: Remove Docker container for publishing packages to Verdaccio

The Dockerfile.publish-packages container only provided a pinned Node.js
version for running `npm publish` of pre-built tarballs. The host already
has the correct Node.js version via Volta, so the Docker build+run overhead
is unnecessary. Run the publish script directly on the host instead.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mydea

dev-packages/e2e-tests/registrySetup.ts

@@ -3,9 +3,6 @@ import * as childProcess from 'child_process';
 import { TEST_REGISTRY_CONTAINER_NAME, VERDACCIO_VERSION } from './lib/constants';
 import { publishPackages } from './lib/publishPackages';
 
-const publishScriptNodeVersion = process.env.E2E_TEST_PUBLISH_SCRIPT_NODE_VERSION;
-const repositoryRoot = path.resolve(__dirname, '../..');
-
 // https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#grouping-log-lines
 function groupCIOutput(groupTitle: string, fn: () => void): void {
   if (process.env.CI) {