Reraise exceptions on Rollbar.process_payload_safely.

[jondeandres]

We will reraise exceptions in Rolbar.process_payload_safely so async queues can retry the job or, in general, handle an error report some way.

At same time that exception is silenced so we don't generate infinite reports. This example is what we want to avoid:

1. New exception in a the project is raised
2. That report enqueued to Sidekiq queue.
3. The Sidekiq job tries to send the report to our API
4. The report fails, for example cause a network failure,
   and a exception is raised
5. We report an internal error for that exception
6. We reraise the exception so Sidekiq job fails and
   Sidekiq can retry the job reporting the original exception
7. Cause the job failed and Sidekiq can be managed by rollbar we'll
   report a new exception.
8. Go to point 2.

We'll then push to Sidekiq queue indefinitely until the network failure is fixed.

Using Rollbar.silenced we avoid the above behavior but Sidekiq will have a chance to retry the original job.

[brianr]

Typo: s/Cause/Because/

[jondeandres]

👍

[dgilperez]

👏