Fix TV pip menu edu text hidden too soon

The edu text takes different amount of time to marquee through
depending on the device language. Previously we would marquee only once
and wait a constant amount of time (10.5s). This is not enough for
some languages.

In this CL we marquee the edu text twice and we wait until the text has
fully shown twice before hiding it away.

This CL moves the edu text logic in a TvPipMenuEduTextDrawer class.
It is responsible for showing the edu text, starting the text scroll
animation, scheduling when to close the edu text drawer and handling
close on demand (when the user interacts with the pip menu)

Bug: 233916208
Test: m && check edu text shows twice for different languages
Change-Id: I97efe446d4bfc71c3c91ca6d86626cb54364a79f