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Fix Arista failures in telemetry_interface_last_change_test (gNMI-1.25)

Add subinterface_0_state_unsupported deviation for Arista as
state telemetry is not populated on the default (index 0) subinterface
(both LAG and Ethernet). The deviation is defined broadly to cover
any unsupported state on subinterface 0, but in this PR it is used
specifically to skip last-change validation while parent interface
validation continues.

Fix LAGMemberFlap and OTGLAGFlap timeout by expecting
LOWER_LAYER_DOWN oper-status on Arista when the LAG goes down due
to member port disable or link loss. The oper-status remains
DOWN when LAG itself is shutdown.