Add cable_length attribute to QoS interfaces module

[ohu1]

SUMMARY

Add 'cable_length' attribute to QoS interfaces module

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

sonic_qos_interfaces

ADDITIONAL INFORMATION

Checklist:

• [x ] I have performed a self-review of my own code to ensure there are no formatting, linting, or security issues
• [x ] I have verified that new and existing unit tests pass locally with my changes
• [x ] I have not allowed coverage numbers to degenerate
• [x ] I have maintained at least 90% code coverage
• [x ] I have commented my code, particularly in hard-to-understand areas
• [x ] I have made corresponding changes to the documentation
• [x ] I have added tests that prove my fix is effective or that my feature works
• [x ] I have maintained backward compatibility or have provided any relevant "breaking_changes" descriptions in a "fragment" file in the "changelogs/fragments" directory of this repository.
• [x ] I have provided a summary for this PR in valid "fragment" file format in the "changelogs/fragments" directory of this repository branch. Reference : Ansible Change Log Document

How Has This Been Tested?

Regression test with updated testcases.

regression-2024-10-14-cable-length.txt.gz