User configs webhook takes too long to run

[augustuswm]

Syncing users during in response to a change in users.toml exceeds that time limit allowed for a request. This causes the request to fail mid processing of the users map. There are a number of optimizations that can be made, but we need a failure large increase to get under the required time.

This may end up needing to be addressed by changing to an async job system. If it does seem that we want to defer this, then we will need to increase the frequency at which the sync runs.