Migrate some simple ready conditions to new ready tracker

Defer/Continue conditions are pretty straightforward, so can
be ported pretty mechanically to the new ready tracker. In
fact, most of the new conditions are already there but just
need to be switched to non-legacy-replacement.

Bug: 294925498
Test: adjusted existing tests
Flag: com.android.window.flags.migrate_basic_legacy_ready
Change-Id: I98f25c8607951597e31f03794da0ba18373c717a