Replace sentry-raven with sentry-ruby gem

[jim]

Describe the bug The current library we use to send errors to Sentry is deprecated:

`sentry-raven` is deprecated! Please migrate to `sentry-ruby`

There is a migration guide that should be helpful. One thing to note is that less information is sent by default. We should probably set config.send_default_pii = true for now to preserve the existing behavior of the system.

The risk to not setting this is that we lose out on query params, which are really useful when diagnosing exceptions. If there is a simpler way to accomplish that, then we can leave config.send_default_pii set to the default.