Fix Bugsnag integration

[jlledom]

Apisonator seems to be reporting to Bugsnag only in production, but not in development or staging. That's because nor staging or development are accepted release stages in Bugsnag for Apisonator, the only accepted ones are production and preview (code). However, we stopped using preview as RACK_ENV when we migrated SaaS to OCP, we now use staging instead, so it must be added to the list of accepted release stages.

This PR also introduces some changes I had to make for the TLS PR, and I think this is a good opportunity to move them to master and reduce that PR size. Those changes are:

• Remove the integration with Airbrake because it's dead code today.
• Update the Bugsnag gem.
• Remove the old custom integration between Bugsnag and Resque. The newer Bugsnag release already includes its own, so we can remove ours.

[mayorova]

Let's remove airbrake mention from here.

Also, can we get rid of this patched resque, I wonder? :thinking: https://github.com/jlledom/apisonator/blob/fix-bugsnag/Gemfile#L59-L60

We can keep the same version to avoid any changes in behavior (except the airbrake integration) for now, but this way we'll be able to upgrade it later.

[jlledom]

Let's remove airbrake mention from here.

Also, can we get rid of this patched resque, I wonder? 🤔 https://github.com/jlledom/apisonator/blob/fix-bugsnag/Gemfile#L59-L60

We can keep the same version to avoid any changes in behavior (except the airbrake integration) for now, but this way we'll be able to upgrade it later.

That makes sense, I'll work on this. We are already removing that fork (and upgrading the resque gem) in the TLS branch anyway

[jlledom]

Let's remove airbrake mention from here.

Also, can we get rid of this patched resque, I wonder? 🤔 https://github.com/jlledom/apisonator/blob/fix-bugsnag/Gemfile#L59-L60

Done