api: Ignore member event in the initial sync

This change speedup the initial sync because we're removing a lot of events that we don't need at the moment. We're getting the list of members just when we enters clicks in a room.
2 jobs from master in 52 minutes 39 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
passed #32233
flatpak

52:39

failed #31781
flatpak

00:09