sauce labs <3 mention in TESTING.md (#20442)
sauce labs <3 mention in TESTING.md (#20442)

* sauce labs <3

* address comment

* update snippet with Joey's comments

jmadler/amphtml,Gregable/amphtml,danielrozenberg/amphtml,dotandads/amphtml,lannka/amphtml,ampproject/amphtml,src-code/amphtml,smartadserver/amphtml,mhc-gh/amphtml,tlong2/amphtml,lannka/amphtml,honeybadgerdontcare/amphtml,cvializ/amphtml,adup-tech/amphtml,Gregable/amphtml,jridgewell/amphtml,ampproject/amphtml,taboola/amphtml,cory-work/amphtml,danielrozenberg/amphtml,Gregable/amphtml,sebastianbenz/amphtml,alanorozco/amphtml,zhangsu/amphtml,smartadserver/amphtml,media-net/amphtml,laterpay/amphtml,techhtml/amphtml,techhtml/amphtml,yandex-pcode/amphtml,erwinmombay/amphtml,prateekbh/amphtml,Gregable/amphtml,media-net/amphtml,ampproject/amphtml,jpettitt/amphtml,taboola/amphtml,sebastianbenz/amphtml,zhangsu/amphtml,voyagegroup/amphtml,danielrozenberg/amphtml,widespace-os/amphtml,nexxtv/amphtml,taboola/amphtml,taboola/amphtml,mhc-gh/amphtml,taboola/amphtml,zhangsu/amphtml,cory-work/amphtml,yandex-pcode/amphtml,sebastianbenz/amphtml,ampproject/amphtml,sharethrough/amphtml,widespace-os/amphtml,zhangsu/amphtml,widespace-os/amphtml,jmadler/amphtml,zhouyx/amphtml,honeybadgerdontcare/amphtml,laterpay/amphtml,laterpay/amphtml,adup-tech/amphtml,erwinmombay/amphtml,zhouyx/amphtml,honeybadgerdontcare/amphtml,zhouyx/amphtml,mhc-gh/amphtml,rsimha-amp/amphtml,prateekbh/amphtml,laterpay/amphtml,voyagegroup/amphtml,cvializ/amphtml,rsimha-amp/amphtml,zhangsu/amphtml,danielrozenberg/amphtml,jridgewell/amphtml,alanorozco/amphtml,media-net/amphtml,cory-work/amphtml,yandex-pcode/amphtml,yandex-pcode/amphtml,media-net/amphtml,voyagegroup/amphtml,techhtml/amphtml,cvializ/amphtml,ampproject/amphtml,cvializ/amphtml,nexxtv/amphtml,ampproject/amphtml,voyagegroup/amphtml,taboola/amphtml,widespace-os/amphtml,techhtml/amphtml,adup-tech/amphtml,erwinmombay/amphtml,taboola/amphtml,sebastianbenz/amphtml,adup-tech/amphtml,cory-work/amphtml,lannka/amphtml,rsimha-amp/amphtml,alanorozco/amphtml,jpettitt/amphtml,lannka/amphtml,adup-tech/amphtml,rsimha-amp/amphtml,nexxtv/amphtml,smartadserver/amphtml,erwinmombay/amphtml,techhtml/amphtml,laterpay/amphtml,smartadserver/amphtml,ampproject/amphtml,prateekbh/amphtml,src-code/amphtml,tlong2/amphtml,jpettitt/amphtml,jmadler/amphtml,laterpay/amphtml,cory-work/amphtml,zhouyx/amphtml,erwinmombay/amphtml,Gregable/amphtml,jmadler/amphtml,mhc-gh/amphtml,yandex-pcode/amphtml,zhangsu/amphtml,mhc-gh/amphtml,sharethrough/amphtml,zhouyx/amphtml,adup-tech/amphtml,sebastianbenz/amphtml,danielrozenberg/amphtml,media-net/amphtml,jpettitt/amphtml,honeybadgerdontcare/amphtml,honeybadgerdontcare/amphtml,danielrozenberg/amphtml,ampproject/amphtml,mhc-gh/amphtml,yandex-pcode/amphtml,tlong2/amphtml,nexxtv/amphtml,nexxtv/amphtml,rsimha-amp/amphtml,sebastianbenz/amphtml,mhc-gh/amphtml,jridgewell/amphtml,nexxtv/amphtml,sharethrough/amphtml,jridgewell/amphtml,techhtml/amphtml,alanorozco/amphtml,widespace-os/amphtml,jmadler/amphtml,Gregable/amphtml,src-code/amphtml,jridgewell/amphtml,cory-work/amphtml,erwinmombay/amphtml,tlong2/amphtml,yandex-pcode/amphtml,jpettitt/amphtml,Gregable/amphtml,zhouyx/amphtml,sharethrough/amphtml,prateekbh/amphtml,prateekbh/amphtml,jridgewell/amphtml,alanorozco/amphtml,nexxtv/amphtml,cory-work/amphtml,dotandads/amphtml,tlong2/amphtml,jpettitt/amphtml,lannka/amphtml,lannka/amphtml,voyagegroup/amphtml,src-code/amphtml,rsimha-amp/amphtml,jpettitt/amphtml,dotandads/amphtml,widespace-os/amphtml,rsimha-amp/amphtml,jmadler/amphtml,src-code/amphtml,media-net/amphtml,sharethrough/amphtml,honeybadgerdontcare/amphtml,alanorozco/amphtml,lannka/amphtml,dotandads/amphtml,voyagegroup/amphtml,danielrozenberg/amphtml,sharethrough/amphtml,cvializ/amphtml,tlong2/amphtml,media-net/amphtml,prateekbh/amphtml,honeybadgerdontcare/amphtml,media-net/amphtml,prateekbh/amphtml,mhc-gh/amphtml,dotandads/amphtml,voyagegroup/amphtml,danielrozenberg/amphtml,dotandads/amphtml,smartadserver/amphtml,src-code/amphtml,smartadserver/amphtml,cvializ/amphtml,zhouyx/amphtml,Gregable/amphtml,jpettitt/amphtml,alanorozco/amphtml,alanorozco/amphtml,jridgewell/amphtml