Add Taskbar education for Circle to Search for pinned taskbar

This change adds a new education tooltip for pinned taskbar that teaches
users how to use Circle to Search invoked through the action key. It won't run on
transient taskbar or if the user is in 3 button mode. The disclosures at
the bottom of the tooltip link to localized legal agreements for the feature.

Fix: 330401405
Test: Pin the taskbar and observe that the next time an app is launched
the edu shows up. After dismissal it shouldn't show up again.
Additionally, click on the disclosures and ensure they launch.
Flag: ACONFIG com.android.launcher3.enable_taskbar_pinning NEXTFOOD

Change-Id: I64aea3004aca77c3ec81b81dea0cfab7a9c1e272