[MM-32622] Remove app.WaitForChannelMembership() (#17048)

* Remove app.WaitForChannelMembership

* Fix tests

* Fix test

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

store/store.go

@@ -171,7 +171,7 @@ type ChannelStore interface {
 	UpdateMember(member *model.ChannelMember) (*model.ChannelMember, error)
 	UpdateMultipleMembers(members []*model.ChannelMember) ([]*model.ChannelMember, error)
 	GetMembers(channelID string, offset, limit int) (*model.ChannelMembers, error)
-	GetMember(channelID string, userId string) (*model.ChannelMember, error)
+	GetMember(ctx context.Context, channelID string, userId string) (*model.ChannelMember, error)
 	GetChannelMembersTimezones(channelID string) ([]model.StringMap, error)
 	GetAllChannelMembersForUser(userId string, allowFromCache bool, includeDeleted bool) (map[string]string, error)
 	InvalidateAllChannelMembersForUser(userId string)
@@ -182,7 +182,7 @@ type ChannelStore interface {
 	InvalidateMemberCount(channelID string)
 	GetMemberCountFromCache(channelID string) int64
 	GetMemberCount(channelID string, allowFromCache bool) (int64, error)
-	GetMemberCountsByGroup(channelID string, includeTimezones bool) ([]*model.ChannelMemberCountByGroup, error)
+	GetMemberCountsByGroup(ctx context.Context, channelID string, includeTimezones bool) ([]*model.ChannelMemberCountByGroup, error)
 	InvalidatePinnedPostCount(channelID string)
 	GetPinnedPostCount(channelID string, allowFromCache bool) (int64, error)
 	InvalidateGuestCount(channelID string)