Backport of [NET-5217] Apply K8s node locality to services and sidecars into release/1.2.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #2748 to be assessed for backporting due to the inclusion of the label backport/1.2.x.

The below text is copied from the body of the original PR.

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Locality-aware routing is based on proxy locality rather than the proxied service. Ensure we propagate locality to both when registering services.

Backporting only to 1.2.x since this feature was introduced in Consul 1.16.0.

Changes proposed in this PR:

• Apply K8s node locality to sidecar proxies in addition to services

How I've tested this PR:

• Added coverage for proxy config field to existing test
• Hand-tested w/ HashiCups demo:

❯ kubectl label node kind-control-plane topology.kubernetes.io/region="us-east-2" --overwrite
node/kind-control-plane labeled
❯ kubectl label node kind-control-plane topology.kubernetes.io/zone="us-east-2a" --overwrite
node/kind-control-plane labeled

Service: (*structs.NodeService)(0x4002ff6900)({
	Kind: (structs.ServiceKind) (len=13) "connect-proxy",
	ID: (string) (len=55) "products-api-cf494ccb9-m97kf-products-api-sidecar-proxy",
	Service: (string) (len=26) "products-api-sidecar-proxy",
	...
	EnableTagOverride: (bool) false,
	Locality: (*structs.Locality)(0x4002771fe0)({
		Region: (string) (len=9) "us-east-2",
		Zone: (string) (len=10) "us-east-2a"
	}),

How I expect reviewers to test this PR: 👀

Checklist:

• Tests added
• CHANGELOG entry added

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Overview of commits

• bfc501a

[zalimeni]

Closing as prior changes to apply locality were not backported