Feat(eos_designs, eos_cli_config_gen): Add BFD option for underlay ISIS

[Shivani-gslab]

Change Summary

Add bfd for isis in the MPLS design.

Related Issue(s)

Fixes #2824

Component(s) name

arista.avd.eos_designs

Proposed changes

Adding underlay_isis_bfd_enable to schema.

Checklist

Repository Checklist

• [x] My code has been rebased from devel before I start
• [x] I have read the CONTRIBUTING document.
• [x] My change requires a change to the documentation and documentation have been updated accordingly.
• [x] I have updated molecule CI testing accordingly. (check the box if not applicable)

[Shivani-gslab]

Minor new issue. Also a general ask, have you investigated if this could just be enabled under the router isis <name> on EOS? So we don't have to enable it on all interfaces.

I checked on lab, we don't have bfd under router isis <name>

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[ClausHolbechArista]

Moving to draft to make it easier to keep track. Please set ready for review when comments have been addressed. Thanks.

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