Do not check document links during push builds (#9213)
Do not check document links during push builds (#9213)

* Add visual-diff test for amp-by-example

* Do not check document links during push builds

* Remove stray file

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mphtml,techhtml/amphtml,jdelhommeau/amphtml,koshka/amphtml,fullspeed-sp/amphtml,arealit/amphtml,keithwrightbos/amphtml,vmarteev/amphtml,comScore/amphtml,nexxtv/amphtml,sharethrough/amphtml,engtat/amphtml,pedjoni8/amphtml,yandex-pcode/amphtml,nexxtv/amphtml,mhc-gh/amphtml,dotandads/amphtml,jmadler/amphtml,mhc-gh/amphtml,ecoron/amphtml,sharethrough/amphtml,wjfang/amphtml,zhangsu/amphtml,adiant/amphtml,voyagegroup/amphtml,laterpay/amphtml,jdelhommeau/amphtml,widespace-os/amphtml,koshka/amphtml,adup-tech/amphtml,jpettitt/amphtml,yieldmo/amphtml,yandex-pcode/amphtml,vmarteev/amphtml,media-net/amphtml,alanorozco/amphtml,jridgewell/amphtml,luciancrasovan/amphtml,erwinmombay/amphtml,laterpay/amphtml,zhangsu/amphtml,gumgum/amphtml,kmh287/amphtml,zhouyx/amphtml,clawr/amphtml,camelburrito/amphtml,gumgum/amphtml,dotandads/amphtml,zhangsu/amphtml,adup-tech/amphtml,zhouyx/amphtml,alanorozco/amphtml,luciancrasovan/amphtml,keithwrightbos/amphtml,taboola/amphtml,donttrustthisbot/amphtml,jpettitt/amphtml,clawr/amphtml,spotxchange/amphtml,avimehta/amphtml,fullspeed-sp/amphtml,honeybadgerdontcare/amphtml,alanorozco/amphtml,zhouyx/amphtml,prateekbh/amphtml,spotxchange/amphtml,lannka/amphtml,media-net/amphtml,donttrustthisbot/amphtml,jridgewell/amphtml,ecoron/amphtml,kamtschatka/amphtml,src-code/amphtml,rajkumarsrk/amphtml,mhc-gh/amphtml,lannka/amphtml,src-code/amphtml,jpettitt/amphtml,yandex-pcode/amphtml,ADITION/amphtml,jdelhommeau/amphtml,kixer-com/amphtml,aghassemi/amphtml,adup-tech/amphtml,Gregable/amphtml,shawnbuso/amphtml,nexxtv/amphtml,rsimha-amp/amphtml,keithwrightbos/amphtml,jridgewell/amphtml,taboola/amphtml,bpaduch/amphtml,voyagegroup/amphtml,arealit/amphtml,Mobusi-ads/amphtml,clawr/amphtml,shawnbuso/amphtml,danielrozenberg/amphtml,widespace-os/amphtml,powdercloud/amphtml,kixer-com/amphtml,engtat/amphtml,alanorozco/amphtml,lannka/amphtml,danielrozenberg/amphtml,smartadserver/amphtml,adiant/amphtml,yieldmo/amphtml,comScore/amphtml,ADITION/amphtml,zhouyx/amphtml,mhc-gh/amphtml,engtat/amphtml,ampproject/amphtml,ampproject/amphtml,zhouyx/amphtml,avimehta/amphtml,cory-work/amphtml,gumgum/amphtml,zhucl/amphtml,koshka/amphtml,lannka/amphtml,zhucl/amphtml,yandex-pcode/amphtml,clawr/amphtml,jpettitt/amphtml,zhucl/amphtml,rsimha-amp/amphtml,pedjoni8/amphtml,zhucl/amphtml,rajkumarsrk/amphtml,gumgum/amphtml,chaveznvg/amphtml,media-net/amphtml,kamtschatka/amphtml,jridgewell/amphtml,kmh287/amphtml,yieldbot/amphtml,vmarteev/amphtml,rajkumarsrk/amphtml,cory-work/amphtml,erwinmombay/amphtml,sklobovskaya/amphtml,spotxchange/amphtml,zhucl/amphtml,kixer-com/amphtml,cvializ/amphtml,jpettitt/amphtml,taboola/amphtml,adup-tech/amphtml,ampproject/amphtml,shawnbuso/amphtml,erwinmombay/amphtml,koshka/amphtml,fullspeed-sp/amphtml,sklobovskaya/amphtml,shawnbuso/amphtml,camelburrito/amphtml,smartadserver/amphtml,taboola/amphtml,jridgewell/amphtml,sriramkrish85/amphtml,tlong2/amphtml,laterpay/amphtml,bpaduch/amphtml,engtat/amphtml,comScore/amphtml,jdelhommeau/amphtml,sebastianbenz/amphtml,dotandads/amphtml,camelburrito/amphtml,kmh287/amphtml,powdercloud/amphtml,nexxtv/amphtml,luciancrasovan/amphtml,koshka/amphtml,comScore/amphtml,laterpay/amphtml,techhtml/amphtml,src-code/amphtml,cory-work/amphtml,voyagegroup/amphtml,danielrozenberg/amphtml,Gregable/amphtml,zhangsu/amphtml,danielrozenberg/amphtml