feat: notifications on failed simulations or checks

[mds1]

When a simulation of an in-progress proposal reverts (or shows some other type of concerning simulation result), it would be helpful if the CI could alert the community of this. For example, it could post a link to the failed simulation in a Discord channel. Alternatively, there could be a GovernanceAlerts contract so CI can call a method that emits an Alert(address governor, uint256 proposalId, string details) event, so communities can setup up watchers for events using any tooling they want

Still TBD how exactly this would work, and needs to be spec'd out more before implementing