caches: Fix bing cache hosts (#27472)
caches: Fix bing cache hosts (#27472)

Bing AMP cache hosts are only reachable with www prepended.
Gregable/amphtml,voyagegroup/amphtml,alanorozco/amphtml,ampproject/amphtml,ampproject/amphtml,alanorozco/amphtml,nexxtv/amphtml,ampproject/amphtml,smartadserver/amphtml,honeybadgerdontcare/amphtml,sharethrough/amphtml,honeybadgerdontcare/amphtml,jmadler/amphtml,lannka/amphtml,sharethrough/amphtml,prateekbh/amphtml,voyagegroup/amphtml,alanorozco/amphtml,lannka/amphtml,rsimha-amp/amphtml,rsimha-amp/amphtml,lannka/amphtml,smartadserver/amphtml,adup-tech/amphtml,alanorozco/amphtml,ampproject/amphtml,jridgewell/amphtml,jmadler/amphtml,jridgewell/amphtml,jridgewell/amphtml,sharethrough/amphtml,jridgewell/amphtml,jpettitt/amphtml,mhc-gh/amphtml,zhouyx/amphtml,yandex-pcode/amphtml,jridgewell/amphtml,zhouyx/amphtml,danielrozenberg/amphtml,voyagegroup/amphtml,adup-tech/amphtml,adup-tech/amphtml,zhouyx/amphtml,voyagegroup/amphtml,smartadserver/amphtml,honeybadgerdontcare/amphtml,media-net/amphtml,Gregable/amphtml,sharethrough/amphtml,jpettitt/amphtml,jmadler/amphtml,lannka/amphtml,yandex-pcode/amphtml,smartadserver/amphtml,mhc-gh/amphtml,voyagegroup/amphtml,smartadserver/amphtml,lannka/amphtml,adup-tech/amphtml,alanorozco/amphtml,media-net/amphtml,Gregable/amphtml,alanorozco/amphtml,media-net/amphtml,jmadler/amphtml,mhc-gh/amphtml,honeybadgerdontcare/amphtml,alanorozco/amphtml,rsimha-amp/amphtml,ampproject/amphtml,adup-tech/amphtml,jridgewell/amphtml,honeybadgerdontcare/amphtml,jpettitt/amphtml,yandex-pcode/amphtml,Gregable/amphtml,prateekbh/amphtml,voyagegroup/amphtml,media-net/amphtml,prateekbh/amphtml,jpettitt/amphtml,danielrozenberg/amphtml,prateekbh/amphtml,zhouyx/amphtml,honeybadgerdontcare/amphtml,rsimha-amp/amphtml,lannka/amphtml,prateekbh/amphtml,mhc-gh/amphtml,voyagegroup/amphtml,jpettitt/amphtml,media-net/amphtml,media-net/amphtml,ampproject/amphtml,yandex-pcode/amphtml,Gregable/amphtml,mhc-gh/amphtml,yandex-pcode/amphtml,jpettitt/amphtml,danielrozenberg/amphtml,mhc-gh/amphtml,rsimha-amp/amphtml,ampproject/amphtml,jridgewell/amphtml,sharethrough/amphtml,media-net/amphtml,nexxtv/amphtml,lannka/amphtml,mhc-gh/amphtml,danielrozenberg/amphtml,prateekbh/amphtml,danielrozenberg/amphtml,Gregable/amphtml,nexxtv/amphtml,yandex-pcode/amphtml,ampproject/amphtml,Gregable/amphtml,danielrozenberg/amphtml,nexxtv/amphtml,zhouyx/amphtml,jmadler/amphtml,sharethrough/amphtml,rsimha-amp/amphtml,mhc-gh/amphtml,nexxtv/amphtml,danielrozenberg/amphtml,adup-tech/amphtml,jmadler/amphtml,Gregable/amphtml,zhouyx/amphtml,media-net/amphtml,jpettitt/amphtml,prateekbh/amphtml,smartadserver/amphtml,danielrozenberg/amphtml,jpettitt/amphtml,yandex-pcode/amphtml,alanorozco/amphtml,zhouyx/amphtml,rsimha-amp/amphtml,nexxtv/amphtml,nexxtv/amphtml,honeybadgerdontcare/amphtml