Feat(eos_cli_config_gen): Add comment under Ethernet Interfaces and Port-Channel interfaces

[gmuloc]

Enhancement summary

Add the two following keys in schema as a preparatory step for #4672

ethernet_interfaces:
  - name: Ethernet1
    comment: foo

port_channel_interfaces:
  - name: Port-Channel42
    comment: foo

Reuse the qos_profiles

Which component of AVD is impacted

eos_cli_config_gen

Use case example

Add a comment under ethernet interfaces / port-channel interfaces showing up in the EOS config

Describe the solution you would like

cf summary for where it should located

the eos template should look like this (from python-avd/pyavd/_eos_cli_config_gen/j2templates/eos/qos-profiles.j2)

{%         if mc_tx_queue.comment is arista.avd.defined %}
{%             for comment_line in mc_tx_queue.comment.splitlines() | arista.avd.default([]) %}
      !! {{ comment_line }}
{%             endfor %}
{%         endif %}

Describe alternatives you have considered

No response

Additional context

No response

Contributing Guide

• I agree to follow this project's Code of Conduct