Additional work for FR #20788

[jeremystretch]

This PR captures some follow-on work for v4.5 FR #20788 that was identified following the initial implementation.

• CableTermination
  • Add the 'connector' integer field to index terminations on either end of a cable
  • Rename the position integer field to cable_positions (plural) and convert it to an array of integers
• All cabled models (device components, power feeds, circuit terminations)
  • Introduce the cable_connector integer field
  • Rename the cable_position integer field to cable_positions (plural) and convert it to an array of integers
  • Introduce set_cable_termination() and clear_cable_termination() methods to simplify setting/clearing of cable termination attributes
• Rework cable profiles to enumerate A & B connectors
• Standardize cable profile names
• Add cable profiles for specific cable types
• Rename migration files
• Extend cable path test suite

[jnovinger]

Had one question and one suggestion: the happy path seems well tested, would be good to confirm the error paths behave as expected too. I think a follow-up housekeeping issue could add tests that explicitly verify validation errors are raised when constraints are violated (e.g., too many terminations for a profile, mismatched connector counts).