allow configuration of "outlier detection" for gateways

#### Feature Description

In https://github.com/hashicorp/consul/pull/7713 (https://github.com/hashicorp/consul/issues/6832), the configuration for 2 outlier detection fields are supported for `proxy.upstreams[].config`. However such feature is not available for gateways yet. The request is to add "outlier detection" support for ingress gateway.

#### Use Case(s)

Controlling the outlier detection behavior for ingress gateway. This is already doable for mesh to mesh, but ingress is missing

Start by reviewing PR 7713 and issue 6832, then trace how proxy.upstreams[].config handles outlier detection and how ingress gateway configuration is processed. Done means the existing outlier detection support is also available for ingress gateways and its configuration behavior can be verified.

Written by the indexing model from the issue text.