custom connected_endpoints_keys

[PieterL75]

Enhancement summary

When defining a new set of custom connected_endpoints_keys, we have to copy over the defaults
as per https://avd.arista.com/5.1/roles/eos_designs/docs/input-variables.html?h=connected_endpoints_keys#connected-endpoints-keys-settings

can we have a custom_connected_endpoints_keys, similar like the custom_node_type_keys that simply merges ?

Which component of AVD is impacted

eos_designs

Use case example

Define an extra connected_endpoints_keys for specific devices

Describe the solution you would like

Create a new groupvar custom_connected_endpoints_keys
# These values will be combined with the defaults; custom connected endpoints keys named the same as a default connected endpoints_keys will replace the default

Describe alternatives you have considered

No response

Additional context

No response

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