Set RSpec.world.wants_to_quit to true when any signal is received by the knapsack_pro gem to allow graceful exit

[ArturT]

Story

TODO: N/A

Related

• log threads unable to give the backtrace #270 (comment)

Description

Set RSpec.world.wants_to_quit to true when any signal is received by the knapsack_pro gem. This allows RSpec to gracefully exit as soon as the signal is received, instead of waiting for the test file to finish running.

This also ensures that external libraries, like datadog-ci, behave properly when RSpec is quitting.

Checklist reminder

• You added the changes to the UNRELEASED section of the CHANGELOG.md, including the needed bump (ie, patch, minor, major)
• You follow the architecture outlined below for RSpec in Queue Mode, which is a work in progress (feel free to propose changes):
  • Pure: lib/knapsack_pro/pure/queue/rspec_pure.rb contains pure functions that are unit tested.
  • Extension: lib/knapsack_pro/extensions/rspec_extension.rb encapsulates calls to RSpec internals and is integration and e2e tested.
  • Runner: lib/knapsack_pro/runners/queue/rspec_runner.rb invokes the pure code and the extension to produce side effects, which are integration and e2e tested.