[RSpec] Fix issues in TimeTracker

[3v0k4]

Story

https://trello.com/c/zrjMajhs/758-support-fix-time-tracker

Description

The time tracker missed some before(:all)/after(:all) that weren't in the top level group.

With this change, the following X gaps are considered before(:all)/after(:all):

describe do
  X (example_started)
  it {}
  X (example_group_started)
  describe do
    X (example_started)
    it {}
    X (example_group_finished)
  end
  X (example_group_started)
  describe do
    X (example_started)
    it {}
  end
  X (example_group_finished)
end

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.