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fix(controller): enable ARP learning on VPC routers that have peerings (#6882)

VPC peering requires ARP learning on the logical router. Cross-VPC traffic
arrives via the peer LRP, so the destination router needs to learn pod MACs
from ARP requests. Without it, packets are mis-forwarded (tunneled instead
of local delivery).

Previously, learnFromARPRequest was only set for EnableExternal and U2O
interconnection. This patch also enables it when any VpcPeerings exist.

Signed-off-by: Apinant U-suwantim <Hello@Apinant.dev>
(cherry picked from commit 70fe40375)

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