Closes #20788: Cable profiles and and position mapping

[jeremystretch]

Closes: #20788

🚧 Work in progress 🚧

• Introduce cable profiles to define mapping & validation logic for various classes of cables (e.g. straight-through vs. breakout)
• Add an optional profile choice field on dcim.Cable
• Add an optional cable_position integer field on all cabled models (e.g. interfaces)
• Rename create_cablepath() to create_cablepaths() and add position support
• Refactored cable path tests
  • Split out base CablePathTestCase class
  • Introduced new profile-based tests in parallel to legacy (non-profile) tests
  • Did not alter any of the legacy tests, to ensure backward compatibility is retained

TODO

• Enable drag-and-drop to reorder cable terminations
• Replicate legacy topology tests using cable profiles