Create SP provided assert.soon in gtest that mimics jstest's assert.soon. Timeout should be globally controlled.

Other teams have already created similar things that should be migrated: https://github.com/10gen/mongo/blob/e7bcf3c59d83a0742ebc4da93d41e48a4974fda6/src/mongo/db/process_health/fault_manager_test_suite.h#L213