Fix issue where an engine could be nested in another engine

[Fryguy]

Solve this by ensuring when we enumerate the engines we look at deeper engines first.

@jrafanie Please review.

This PR also changes the stubbing of the Rails Engines paths a little higher so we can exercise more of the code in rails_engines_paths.

[miq-bot]

Checked commit https://github.com/Fryguy/manageiq/commit/e6132025fd3936dd6c2b035186247903264497c8 with ruby 3.1.5, rubocop 1.56.3, haml-lint 0.51.0, and yamllint 2 files checked, 3 offenses detected

spec/lib/extensions/brakeman_fingerprint_patch_spec.rb

• [ ] :bomb: :boom: :fire: :fire_engine: - Line 6, Col 22 - Lint/Syntax - unexpected token tEQL (Using Ruby 2.7 parser; configure using TargetRubyVersion parameter, under AllCops)
• [ ] :bomb: :boom: :fire: :fire_engine: - Line 7, Col 22 - Lint/Syntax - unexpected token tEQL (Using Ruby 2.7 parser; configure using TargetRubyVersion parameter, under AllCops)
• [ ] :bomb: :boom: :fire: :fire_engine: - Line 8, Col 20 - Lint/Syntax - unexpected token tEQL (Using Ruby 2.7 parser; configure using TargetRubyVersion parameter, under AllCops)

[Fryguy]

@jrafanie I rekicked manageiq-api - run is here: https://github.com/ManageIQ/manageiq-api/actions/runs/10949539587

[jrafanie]

🎉