LaunchConfiguration pagination and retention

[eytan-avisror]

Looks like we are not paginating when we call DescribeLaunchConfigurations, we must paginate to be sure we get all launch configurations.

Also, we should do some work around the retention of launch configurations and possibly make it configurable (either globally or per CR).
Right now we are deferring a deletion but ignore failures, this can cause leak of launch configurations under some conditions