Added admin-toolbar to CI publish pipeline and release tooling (#28244)

The admin-toolbar package was missing from the CI publish pipeline,
so it was never published to npm and the jsDelivr CDN URL returned
404 in production. The toolbar only worked in dev mode where Docker
overrides the script URL to a local Vite server.

Added admin-toolbar to the build_packages and publish_packages CI
matrices, the E2E artifact archive, version bump checks, release 
scripts, and devcontainer gateway config — matching the setup of
every other public app.