ui: [FEATURE] Disable Peer Detail and Peer List Routes for HCP Deployments

### Description

Use a configuration exposed by the Consul backend to disable the Peering UI for HCP managed clusters.

We may also wish to utilize the previously created configuration value (`HCPEnabled`) to indicate at a more general level whether a cluster is managed by HCP, however the specific killswitch config would be more appropriate and not require future changes.

This work has a blocking dependency on the backend implementing the config.

### Requirements

1. If the peering killswitch config is enabled, disable access to the peers listview and details routes
2. Optionally, if the `HCPEnabled` config is enabled, disable access to the peers listview and details routes