Goodbye, GraphQL (#24827)

```release-note
NONE
```

server/channels/store/store.go

@@ -201,7 +201,6 @@ type ChannelStore interface {
 	GetDeletedByName(team_id string, name string) (*model.Channel, error)
 	GetDeleted(team_id string, offset int, limit int, userID string) (model.ChannelList, error)
 	GetChannels(teamID, userID string, opts *model.ChannelSearchOpts) (model.ChannelList, error)
-	GetChannelsWithCursor(teamId string, userId string, opts *model.ChannelSearchOpts, afterChannelID string) (model.ChannelList, error)
 	GetChannelsByUser(userID string, includeDeleted bool, lastDeleteAt, pageSize int, fromChannelID string) (model.ChannelList, error)
 	GetAllChannelMembersById(id string) ([]string, error)
 	GetAllChannels(page, perPage int, opts ChannelSearchOpts) (model.ChannelListWithTeamData, error)
@@ -256,7 +255,6 @@ type ChannelStore interface {
 	GetMembersForUser(teamID string, userID string) (model.ChannelMembers, error)
 	GetTeamMembersForChannel(channelID string) ([]string, error)
 	GetMembersForUserWithPagination(userID string, page, perPage int) (model.ChannelMembersWithTeamData, error)
-	GetMembersForUserWithCursor(userID, teamID string, opts *ChannelMemberGraphQLSearchOpts) (model.ChannelMembers, error)
 	Autocomplete(userID, term string, includeDeleted, isGuest bool) (model.ChannelListWithTeamData, error)
 	AutocompleteInTeam(teamID, userID, term string, includeDeleted, isGuest bool) (model.ChannelList, error)
 	AutocompleteInTeamForSearch(teamID string, userID string, term string, includeDeleted bool) (model.ChannelList, error)
@@ -1079,16 +1077,6 @@ type ThreadMembershipOpts struct {
 	UpdateParticipants bool
 }
 
-// ChannelMemberGraphQLSearchOpts contains the options for a graphQL query
-// to get the channel members.
-type ChannelMemberGraphQLSearchOpts struct {
-	AfterChannel string
-	AfterUser    string
-	Limit        int
-	LastUpdateAt int
-	ExcludeTeam  bool
-}
-
 // PostReminderMetadata contains some info needed to send
 // the reminder message to the user.
 type PostReminderMetadata struct {