[openstreetmap/openstreetmap-website] Update embed.js.erb to use CDN test URLs (#2714)

[mmd]

I have two questions on cache validity and expiry mechanisms on fastly:
*  How long will fastly keep cached tiles around before they expire, and new tiles will be fetched from other caches or the rendering server?
* What are options to selectively purge cache contents on fastly in case of vandalism?







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