SF: change the min supported frame rate to 1Hz

Divided the long running tests into multiple tests,
so these tests don't take as much time and can finish
with the increased number of refresh rate ranges.
Updated the tests in the next cl to check over the
range of refresh rates from the start and end.

Test: atest libsurfaceflinger_unittest
BUG: 261520501
Change-Id: I7cd197c39d4482cedbf54e7ddf0d7450e808a289