Remove legacy recent animation perf test

Since shell transition is enabled, startRecentsActivity is no
longer used to enter recent.

And because shell recent animation uses the regular transition,
the perf metrics of "Transition Delay - App to Quickstep" is enough.

Bug: 131727899
Test: build
Change-Id: Iee8cbf980d5ca16f3cad0c19d9717a7bcb388740