Taskcluster config needs to point to the kaios project branch

[EricRahm]

We need to modify the URL used by taskcluster to calculate changes so that it uses our project branch. This reduces decision task times from 30 minutes to 6 minutes.

Please land the patch from D83718: https://d3kxowhw4s8amj.cloudfront.net/file/data/hzwljt2q2xdkayzxt2lb/PHID-FILE-jy7ktxjsyo4a6iaxgb63/D83718.diff

[fabricedesre]

Pushed in f2d5905