Make unfold timeout configurable in resources

This allows to have a different timeout for the emulator, and to write better e2e integration tests for the unfold transition.
For now, the timeout is pretty low and the emulator is not able do dump all the views in time.

Test: atest DeviceFoldStateProviderTest
Bug: 220087235
Change-Id: Icd45a312c878f0a9d9f33f35cbaf4bac37cc5dd1