Reapply "[fuzzer][Fuchsia] Prevent deadlock from suspending threads" … (#155271) …(#155042) This reverts commit 781a4db6b50bb660cb293d3e7e29957aeb4b02ac. Relanded with the fix declaring StartRssThread. GitOrigin-RevId: 7153392a1089107d419ae9234486263b748b9e88