test: Fix the tcp-accept-stress test
test: Fix the tcp-accept-stress test

It was previously asserted that each thread received at least one connection,
but this is not guaranteed to always be the case due to scheduling. This test
also deadlocked on failure due to a lingering reference to the sending half of
the channel, so that reference is now also eagerly dropped so the test can fail
properly if something bad happens.

Closes #16872

GBGamer/rust,aepsil0n/rust,mvdnes/rust,XMPPwocky/rust,TheNeikos/rust,avdi/rust,TheNeikos/rust,aneeshusa/rust,philyoon/rust,mvdnes/rust,pelmers/rust,krzysz00/rust,ebfull/rust,untitaker/rust,robertg/rust,aneeshusa/rust,zaeleus/rust,pshc/rust,vhbit/rust,miniupnp/rust,pelmers/rust,seanrivera/rust,0x73/rust,krzysz00/rust,aepsil0n/rust,0x73/rust,ebfull/rust,jroesch/rust,graydon/rust,ejjeong/rust,reem/rust,miniupnp/rust,zaeleus/rust,zaeleus/rust,jashank/rust,KokaKiwi/rust,reem/rust,robertg/rust,emk/rust,0x73/rust,zachwick/rust,bombless/rust,jashank/rust,omasanori/rust,TheNeikos/rust,omasanori/rust,pelmers/rust,vhbit/rust,richo/rust,zachwick/rust,philyoon/rust,untitaker/rust,bombless/rust-docs-chinese,bombless/rust,avdi/rust,zaeleus/rust,sae-bom/rust,krzysz00/rust,KokaKiwi/rust,robertg/rust,l0kod/rust,mihneadb/rust,mdinger/rust,graydon/rust,AerialX/rust-rt-minimal,mihneadb/rust,P1start/rust,AerialX/rust,mahkoh/rust,ruud-v-a/rust,AerialX/rust,carols10cents/rust,aneeshusa/rust,pshc/rust,ejjeong/rust,bombless/rust,KokaKiwi/rust,omasanori/rust,dinfuehr/rust,andars/rust,P1start/rust,carols10cents/rust,jroesch/rust,aneeshusa/rust,erickt/rust,AerialX/rust-rt-minimal,P1start/rust,mahkoh/rust,nwin/rust,aepsil0n/rust,andars/rust,emk/rust,gifnksm/rust,richo/rust,l0kod/rust,jashank/rust,GBGamer/rust,emk/rust,untitaker/rust,carols10cents/rust,andars/rust,philyoon/rust,l0kod/rust,gifnksm/rust,sae-bom/rust,barosl/rust,AerialX/rust-rt-minimal,victorvde/rust,nwin/rust,graydon/rust,sae-bom/rust,mdinger/rust,ktossell/rust,mahkoh/rust,quornian/rust,barosl/rust,sae-bom/rust,mihneadb/rust,avdi/rust,victorvde/rust,defuz/rust,zubron/rust,seanrivera/rust,ruud-v-a/rust,GBGamer/rust,avdi/rust,aidancully/rust,mihneadb/rust,aneeshusa/rust,rprichard/rust,jroesch/rust,miniupnp/rust,richo/rust,jroesch/rust,l0kod/rust,mihneadb/rust,dwillmer/rust,jashank/rust,TheNeikos/rust,mdinger/rust,kimroen/rust,KokaKiwi/rust,kwantam/rust,defuz/rust,richo/rust,reem/rust,pshc/rust,kwantam/rust,jroesch/rust,philyoon/rust,mvdnes/rust,emk/rust,emk/rust,ktossell/rust,zubron/rust,XMPPwocky/rust,jroesch/rust,quornian/rust,hauleth/rust,nham/rust,dwillmer/rust,sae-bom/rust,vhbit/rust,0x73/rust,rohitjoshi/rust,AerialX/rust,krzysz00/rust,erickt/rust,XMPPwocky/rust,P1start/rust,reem/rust,richo/rust,erickt/rust,dwillmer/rust,robertg/rust,ebfull/rust,vhbit/rust,nwin/rust,AerialX/rust-rt-minimal,pelmers/rust,ktossell/rust,0x73/rust,krzysz00/rust,mdinger/rust,aepsil0n/rust,kwantam/rust,rohitjoshi/rust,emk/rust,cllns/rust,rprichard/rust,jroesch/rust,kwantam/rust,miniupnp/rust,ejjeong/rust,AerialX/rust,ktossell/rust,pshc/rust,nham/rust,GBGamer/rust,mihneadb/rust,mdinger/rust,XMPPwocky/rust,philyoon/rust,aidancully/rust,victorvde/rust,dinfuehr/rust,gifnksm/rust,carols10cents/rust,nwin/rust,avdi/rust,seanrivera/rust,kimroen/rust,graydon/rust,dinfuehr/rust,dwillmer/rust,AerialX/rust,jashank/rust,barosl/rust,ktossell/rust,nwin/rust,omasanori/rust,jashank/rust,P1start/rust,rprichard/rust,barosl/rust,quornian/rust,TheNeikos/rust,cllns/rust,avdi/rust,nham/rust,zubron/rust,victorvde/rust,hauleth/rust,zubron/rust,robertg/rust,pshc/rust,ebfull/rust,erickt/rust,gifnksm/rust,mahkoh/rust,aidancully/rust,ktossell/rust,pshc/rust,mahkoh/rust,aidancully/rust,zaeleus/rust,barosl/rust,omasanori/rust,zachwick/rust,bombless/rust,kimroen/rust,graydon/rust,zachwick/rust,rohitjoshi/rust,graydon/rust,TheNeikos/rust,untitaker/rust,pelmers/rust,jashank/rust,hauleth/rust,defuz/rust,reem/rust,P1start/rust,GBGamer/rust,nham/rust,victorvde/rust,cllns/rust,dwillmer/rust,XMPPwocky/rust,AerialX/rust,carols10cents/rust,nwin/rust,mvdnes/rust,nham/rust,robertg/rust,dinfuehr/rust,kimroen/rust,pshc/rust,P1start/rust,victorvde/rust,rohitjoshi/rust,kimroen/rust,quornian/rust,dwillmer/rust,defuz/rust,philyoon/rust,l0kod/rust,ejjeong/rust,KokaKiwi/rust,rprichard/rust,ruud-v-a/rust,untitaker/rust,vhbit/rust,mahkoh/rust,mdinger/rust,sae-bom/rust,mvdnes/rust,mvdnes/rust,ejjeong/rust,0x73/rust,vhbit/rust,bombless/rust,ktossell/rust,ruud-v-a/rust,seanrivera/rust,seanrivera/rust,vhbit/rust,gifnksm/rust,0x73/rust,l0kod/rust,pshc/rust,l0kod/rust,AerialX/rust-rt-minimal,andars/rust,carols10cents/rust,ebfull/rust,jroesch/rust,ruud-v-a/rust,richo/rust,nham/rust,nwin/rust,zubron/rust,cllns/rust,aneeshusa/rust,quornian/rust,miniupnp/rust,miniupnp/rust,GBGamer/rust,aidancully/rust,kwantam/rust,barosl/rust,GBGamer/rust,rohitjoshi/rust,andars/rust,defuz/rust,kimroen/rust,krzysz00/rust,nham/rust,nwin/rust,zubron/rust,kimroen/rust,bombless/rust,seanrivera/rust,GBGamer/rust,zubron/rust,miniupnp/rust,pelmers/rust,rohitjoshi/rust,KokaKiwi/rust,hauleth/rust,dinfuehr/rust,rprichard/rust,XMPPwocky/rust,reem/rust,kwantam/rust,dwillmer/rust,erickt/rust,emk/rust,zubron/rust,dinfuehr/rust,zachwick/rust,quornian/rust,AerialX/rust-rt-minimal,cllns/rust,ejjeong/rust,aepsil0n/rust,erickt/rust,aidancully/rust,cllns/rust,rprichard/rust,vhbit/rust,defuz/rust,hauleth/rust,gifnksm/rust,erickt/rust,andars/rust,ebfull/rust,quornian/rust,l0kod/rust,untitaker/r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