Add SignalException to default ignore_classes

[tobyhs]

Goal

With #397 we receive SignalException error reports when puma shuts down, which aren't really errors.

Changeset

Added

Removed

Changed

• Changed Interrupt to SignalException in the default Bugsnag::Configuration's ignore_classes

Linked issues

Related to #397 and #477

Review

For the submitter, initial self-review:

• Commented on code changes inline explain the reasoning behind the approach
• Reviewed the test cases added for completeness and possible points for discussion
• A changelog entry was added for the goal of this pull request
• Check the scope of the changeset - is everything in the diff required for the pull request?
• This pull request is ready for:
  • Initial review of the intended approach, not yet feature complete
  • Structural review of the classes, functions, and properties modified
  • Final review

For the pull request reviewer(s), this changeset has been reviewed for:

• Consistency across platforms for structures or concepts added or modified
• Consistency between the changeset and the goal stated above
• Internal consistency with the rest of the library - is there any overlap between existing interfaces and any which have been added?
• Usage friction - is the proposed change in usage cumbersome or complicated?
• Performance and complexity - are there any cases of unexpected O(n^3) when iterating, recursing, flat mapping, etc?
• Concurrency concerns - if components are accessed asynchronously, what issues will arise
• Thoroughness of added tests and any missing edge cases
• Idiomatic use of the language

[snmaynard]

In some integrations we do something similar to hide certain exception types. I feel like we should stop doing that as we have moved them into default ignore classes. Places like

bugsnag-ruby/lib/bugsnag/integrations/sidekiq.rb

Line 25 in 35b3ef0

raise ex if [Interrupt, SystemExit, SignalException].include? ex.class

Has been addressed

[Cawllec]

This LGTM, but as I've added to it can I get a review from someone else in the @bugsnag/platforms group