test: fix fmt pass and shorten suppression warnings
test: fix fmt pass and shorten suppression warnings

If gosimple or staticcheck had no output, it no other passes would be
applied because they were using `continue`. Similarly, the suppression
check never worked at all since it wasn't the result data into egrep.

Fixes #7685

sinsharat/etcd,armstrongli/etcd,joshix/etcd,coreos/etcd,dannysauer/etcd,whuwxl/etcd,coreos/etcd,mkumatag/etcd,etcd-io/etcd,plasticbox/etcd,tguangch/etcd,fanminshi/etcd,heyitsanthony/etcd,mickep76/etcd,whuwxl/etcd,cockroachdb/etcd,tguangch/etcd,rnaveiras/etcd,plasticbox/etcd,YuleiXiao/etcd,yudai/etcd,mqliang/etcd,akauppi/etcd,YuleiXiao/etcd,armstrongli/etcd,bluebreezecf/etcd,lorneli/etcd,akauppi/etcd,mkumatag/etcd,joshix/etcd,bdarnell/etcd,ajityagaty/etcd,mickep76/etcd,rnaveiras/etcd,glevand/coreos--etcd,ajityagaty/etcd,mqliang/etcd,dannysauer/etcd,yudai/etcd,heyitsanthony/etcd,sebrandon1/etcd,sinsharat/etcd,a-robinson/etcd,cockroachdb/etcd,mqliang/etcd,xiang90/etcd,glevand/coreos--etcd,visheshnp/etcd,lorneli/etcd,gyuho/etcd,vimalk78/etcd,ajityagaty/etcd,bluebreezecf/etcd,sebrandon1/etcd,etcd-io/etcd,fanminshi/etcd,vimalk78/etcd,bdarnell/etcd,li-ang/etcd,li-ang/etcd,rnaveiras/etcd,gyuho/etcd,mkumatag/etcd,a-robinson/etcd,visheshnp/etcd,xiang90/etcd,etcd-io/etcd