RSpec (Queue): Avoid init if queue already exists

[3v0k4]

Description

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Checks

• I added the changes to the UNRELEASED section of the CHANGELOG.md, including the needed bump (i.e., patch, minor, major)
• I followed the architecture outlined below for RSpec in Queue Mode:
  • 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]

It looks great.