Changes the Ivy unknown element/property messages from being logged with `console.warn` to `console.error`. This should make them a bit more visible without breaking existing apps. Furthermore, a lot of folks filter out warning messages in the dev tools' console, whereas errors are usually still shown.
BREAKING CHANGE:
Warnings about unknown elements are now logged as errors. This won't break your app, but it may trip up tools that expect nothing to be logged via `console.error`.
Fixes#35699.
PR Close#36399
9d9d46f52b