MM-44088: Add teamID filter to channelMembers (#20176)

We add 2 new params to channel members query.
1. Filter by teamId.
2. Negate that filter.

We include some more optimizations like:
- Moved the team role checks inside the dataloader.
- Moved the channel pretty name computation inside the loader.

Now that we load less data on initial load, we can reduce
the concurrency requirement to be a bit on the safer side.

```release-note
NONE
```

store/timerlayer/timerlayer.go

@@ -1365,10 +1365,10 @@ func (s *TimerLayerChannelStore) GetMembersForUser(teamID string, userID string)
 	return result, err
 }
 
-func (s *TimerLayerChannelStore) GetMembersForUserWithCursor(userID string, afterChannel string, afterUser string, limit int, lastUpdateAt int) (model.ChannelMembers, error) {
+func (s *TimerLayerChannelStore) GetMembersForUserWithCursor(userID string, teamID string, opts *store.ChannelMemberGraphQLSearchOpts) (model.ChannelMembers, error) {
 	start := timemodule.Now()
 
-	result, err := s.ChannelStore.GetMembersForUserWithCursor(userID, afterChannel, afterUser, limit, lastUpdateAt)
+	result, err := s.ChannelStore.GetMembersForUserWithCursor(userID, teamID, opts)
 
 	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
 	if s.Root.Metrics != nil {