Configure RSpec backtrace error reporting

[lancejjohnson]

Filter from the back trace commonly used gems during RSpec failure logging. Many framework gems are rarely relevant in tracing testing errors, particularly while doing TDD, and their presence in the failure log makes it more difficult to find the test error that is driving the next change.

For example,

GEMS_TO_EXCLUDE_FROM_BACKTRACE = %w[
  bootsnap
  capybara
  delayed_job
  factory_bot
  honeybadger
  rack
  railties
  shoulda-matchers
  skylight
  sprockets-rails
]

RSpec.configure do |config|
  config.filter_rails_from_backtrace!
  config.filter_gems_from_backtrace(*GEMS_TO_EXCLUDE_FROM_BACKTRACE)
end

RSpec allows developers to temporarily suspend this filtering through the use of the --backtrace flag should seeing those gems be necessary.