Mirror on drop export to sflow collector

[dgonzalez85]

Enhancement summary

Mirror on drop is a network visibility feature which allows monitoring of flow drops occurring in the ingress pipeline. When such a drop is detected, it is sent to the control plane where it is processed and then sent to configured collectors. We need this feature for AI deployments visibility.

We need to configure the following in EOS to sflow:

flow tracking mirror-on-drop
   tracker sflowtrack
      exporter exp
         format sflow
         collector sflow

However currently is not supported to set format or collector "sflow":
https://avd.arista.com/5.1/roles/eos_cli_config_gen/docs/input-variables.html#flow-tracking

The full TOI can be found here:
https://www.arista.com/en/support/toi/eos-4-23-2f/14442-mirror-on-drop

The TOI explains that export sFlow samples to collectors configured under global sFlow configuration can be configured, such as:

flow tracking mirror-on-drop
   encapsulation mpls
   sample limit 100 pps
   !
   tracker tr
      exporter exp
         format sflow
         collector sflow
         local interface Ethernet1
   no shutdown

Which component of AVD is impacted

eos_cli_config_gen

Use case example

Enable mirror on drop visibility to sflow collector in AI fabric.

Describe the solution you would like

Support for sflow format and collectors.

Describe alternatives you have considered

No response

Additional context

No response

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