Support for agent shutdown option

[dgonzalez85]

Enhancement summary

Trying to replicate AI configuration deployments where PTP agent is disabled to prevent unnecessary usage resources.

agent SandPtp shutdown
agent PtpTimeSync shutdown

AVD currently does not support the shutdown option:
https://avd.arista.com/5.1/roles/eos_cli_config_gen/docs/input-variables.html#agents

We can do using eos_cli commands but ideally to configure this using native AVD commands.

Which component of AVD is impacted

eos_cli_config_gen

Use case example

Trying to replicate AI configuration deployments where PTP agent is disabled to prevent unnecessary usage resources.

Describe the solution you would like

Expand the agents configuration to support shutdown option.

Describe alternatives you have considered

custom_structured_configuration_eos_cli: |
agent SandPtp shutdown
agent PtpTimeSync shutdown

Additional context

No response

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