configitems: enable changegroup3 by default
The LFS extension requires this, and if it isn't enabled on the client (or the LFS extension isn't loaded), the client gets a 500 instead of a sensible error message. c0f11347b107 indicates that treemanifest repos have this issue too. 29cfc474c5fd mentions gating this behind `experimental` so that the format could change, but that was 7 years ago and we now have an experimental `changegroup4` as well. We can keep this as a config for the next cycle in case someone runs into an unexpect problem, and then jettison it.
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