Do not recycle conversations in Compose PeopleSpace implementation

As shown in http://go/sysui-compose-performance-results, the current
Compose implementation that is lazy is less performant than a non-lazy
one that does not do any recycling. This CL removes the lazy behavior we
previously had.

Bug: 238993727
Test: PeopleSpaceActivityTest, PeopleSpaceFlingTest
Change-Id: I811edc9c04163d3fc4050313d0a32f0f5417aa4d