Summary: For bridgeless RN we're not going to use the JSTimers module + Timing native module for timers (e.g. setTimeout, setImmediate, etc.). Instead we're going to install global functions from cpp for each of these, so we can just skip setUpTimers entirely in this case.
Reviewed By: fkgozali
Differential Revision: D15790638
fbshipit-source-id: 1626fe90a27cb8d385cbb700ad932969f708f0cb