Upgrade from raven to sentry_sdk

[tonyandrewmeyer]

We should replace our use of raven with sentry_sdk for reporting errors to Sentry.

[LaurentiuTeodorescu]

@tonyandrewmeyer , what exacty is required to get this out/published?

[tonyandrewmeyer]

Someone (I assume me) will have to update the installed version and ensure that the right DSN is in the configuration files. I guess assign the ticket to me and I can do it.