Remove deprecated icon / render hook aliases

[danharrin]

Note: I am not looking for a community member to do this, it will be handled by myself or another member of the Filament core team closer to release.

[Youssef-Amjad]

Note: I am not looking for a community member to do this, it will be handled by myself or another member of the Filament core team closer to release.

You are a truly amazing team