Add Reins of the Ascendant Skyrazor (once it turns into a 1% drop)

[rdw-software]

This is a reminder (added to the next expansion milestone) since I'm likely to forget by the time the expansion launch is imminent.

Not actionable for now, but here's the link: https://www.wowhead.com/item=224151/reins-of-the-ascendant-skyrazor

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Split off from #734.