WAITAOF: Update fsynced_reploff_pending just before starting the initial AOFRW fork (#12620)
If we set `fsynced_reploff_pending` in `startAppendOnly`, and the fork doesn't start immediately (e.g. there's another fork active at the time), any subsequent commands will increment `server.master_repl_offset`, but will not cause a fsync (given they were executed before the fork started, they just ended up in the RDB part of it) Therefore, any WAITAOF will wait on the new master_repl_offset, but it will time out because no fsync will be executed. Release notes: ``` WAITAOF could timeout in the absence of write traffic in case a new AOF is created and an AOFRW can't immediately start. This can happen by the appendonly config is changed at runtime, but also after FLUSHALL, and replica full sync. ``` (cherry picked from commit bfa3931a)
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