[RSpec] [Queue Mode] Log error message and backtrace when unexpected failure raised in process

[tubaxenor]

Description

Currently when unexpected error raised, we only get the class name from exception.inspect, this PR adds details to the logger to be able to trace or debug the cause.

Changes

Add more logs when unexpected error raised in runner process.

Checklist reminder

• 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.

[ArturT]

Thank you for the contribution. We've released the knapsack_pro v7.1.0 gem version.