refactor(registry): Remove unused legacy payload methods
refactor(registry): Remove unused legacy payload methods

coreos/fleet,webwlsong/fleet,giantswarm/fleet,WPMedia/fleet,hhoover/fleet,improbable-io/fleet,mischief/fleet,giantswarm/fleet,dongsupark/fleet,mookjp/fleet,webwlsong/fleet,thepwagner/fleet,dongsupark/fleet,mwitkow-io/fleet,mischief/fleet,bcwaldon/fleet,flandr/fleet,mwitkow-io/fleet,dalbani/fleet,octoblu/fleet,ecnahc515/fleet,esatterwhite/fleet,octoblu/fleet,bcwaldon/fleet,mwhooker/fleet,mwhooker/fleet,coreos/fleet,bviswana101/fleet,esatterwhite/fleet,jonboulle/fleet,improbable-io/fleet,thepwagner/fleet,mwitkow/fleet,endocode/fleet,jonboulle/fleet,mwitkow/fleet,ecnahc515/fleet,improbable-io/fleet,endocode/fleet,hhoover/fleet,coreos/fleet,jonboulle/fleet,dalbani/fleet,bviswana101/fleet,bcwaldon/fleet,paveltiunov/fleet,mookjp/fleet,wuqixuan/fleet,WPMedia/fleet,dalbani/fleet,ecnahc515/fleet,dongsupark/fleet,wuqixuan/fleet,flandr/fleet,paveltiunov/fleet,giantswarm/fleet,endocode/fleet