Migrating Team.SaveMember/SaveMultipleMembers into errors (#14924)

* Migrating Team.SaveMember/SaveMultipleMembers into errors

* Removing copy/paste comments

* Fixing another small thing

* Fixing tests

* Addressing PR review comments

* Fixing some tests

* Fixing golangci-lint

* Fixing linter

* Regenerating store layers

* Fix lint error after merge

* Other lint error fixed

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

store/store.go

@@ -91,8 +91,8 @@ type TeamStore interface {
 	AnalyticsTeamCount(includeDeleted bool) (int64, *model.AppError)
 	AnalyticsPublicTeamCount() (int64, *model.AppError)
 	AnalyticsPrivateTeamCount() (int64, *model.AppError)
-	SaveMultipleMembers(members []*model.TeamMember, maxUsersPerTeam int) ([]*model.TeamMember, *model.AppError)
-	SaveMember(member *model.TeamMember, maxUsersPerTeam int) (*model.TeamMember, *model.AppError)
+	SaveMultipleMembers(members []*model.TeamMember, maxUsersPerTeam int) ([]*model.TeamMember, error)
+	SaveMember(member *model.TeamMember, maxUsersPerTeam int) (*model.TeamMember, error)
 	UpdateMember(member *model.TeamMember) (*model.TeamMember, *model.AppError)
 	UpdateMultipleMembers(members []*model.TeamMember) ([]*model.TeamMember, *model.AppError)
 	GetMember(teamId string, userId string) (*model.TeamMember, *model.AppError)