Add appProtocol to nxrm-ha-hl service or prefix containerPort with "http-"

[AMEvers]

Currently the nexus chart is using a named containerPort of "nexus-ui" for it's UI frontend port. This makes it unusable with the Istio service mesh which either keys off of appProtocol on the k8s service or looks for the protocol as a prefix to the name. I personally think defining the appProtocol in the service is better form but prefixing named containerPorts with http- (or just naming them http) is a standard convention that almost every helmchart uses. Either change is a fairly small.

[AMEvers]

For reference to other charts who follow this convention, here are some examples:

• prometheus in all their charts
• grafana as well as the rest of their stack
• artifactory
• bitnami in every one of their charts
• argocd uses appProtocol
• fluxcd officially uses kustomizations instead of helm but also uses this naming convention
• elasticsearch
• harbor
• minio
• cert-manager
• jira as well as every other atlassian helmchart
• kyverno
• coder
• velero
• hashicorp vault