hashibot: Temporarily disable issue migration
hashibot: Temporarily disable issue migration

The bot seems to currently be running into some operational problems that are
creating noise for provider development teams by potentially migrating issues
multiple times.

This is just a tactical change to stop the annoying symptoms right now, to
give some time to figure out what's actually going on here.
rnaveiras/terraform,hashicorp/terraform,pdecat/terraform,ewbankkit/terraform,ewbankkit/terraform,tommynsong/terraform,apparentlymart/terraform,pdecat/terraform,apparentlymart/terraform,rnaveiras/terraform,pdecat/terraform,apparentlymart/terraform,hashicorp/terraform,ewbankkit/terraform,apparentlymart/terraform,apparentlymart/terraform,pdecat/terraform,tommynsong/terraform,hashicorp/terraform,ewbankkit/terraform,rnaveiras/terraform,tommynsong/terraform