✨ Add Index Exchange as a vendor to DoubleClick RTC (#13878)
✨ Add Index Exchange as a vendor to DoubleClick RTC (#13878)

* Add Index Exchange as a vendor to RTC config [ADS-2701]

* Strings have to be single quoted [ADS-2701]

* Move HREF macro to the end of the vendor URL for cases where it may get truncated to fit length restrictions [ADS-2701]

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gh/amphtml,aghassemi/amphtml,erwinmombay/amphtml,yandex-pcode/amphtml,sebastianbenz/amphtml,bpaduch/amphtml,tlong2/amphtml,media-net/amphtml,cvializ/amphtml,danielrozenberg/amphtml,lannka/amphtml,ampproject/amphtml,Gregable/amphtml,zhouyx/amphtml,jpettitt/amphtml,camelburrito/amphtml,yieldmo/amphtml,erwinmombay/amphtml,jpettitt/amphtml,adup-tech/amphtml,prateekbh/amphtml