[MM-21464] api4/channel: add ability to force move channel by removing non-members (#14887)

* api4/channel: add ability to force move channel by removing non-members

* app/channel: add log to move channel for non taget team members

* app/channel: add tets for remove non-team members for channel

* Update api4/channel_test.go

Co-authored-by: Eli Yukelzon <reflog@gmail.com>

Co-authored-by: Eli Yukelzon <reflog@gmail.com>

app/app_iface.go

@@ -805,6 +805,7 @@ type AppIface interface {
 	RemoveTeamMemberFromTeam(teamMember *model.TeamMember, requestorId string) *model.AppError
 	RemoveUserFromChannel(userIdToRemove string, removerUserId string, channel *model.Channel) *model.AppError
 	RemoveUserFromTeam(teamId string, userId string, requestorId string) *model.AppError
+	RemoveUsersFromChannelNotMemberOfTeam(remover *model.User, channel *model.Channel, team *model.Team) *model.AppError
 	RequestId() string
 	ResetPasswordFromToken(userSuppliedTokenString, newPassword string) *model.AppError
 	ResetPermissionsSystem() *model.AppError