Add additional labels, annotations and ingress improvements

[zadjadr]

Added

• additionalAnnotations for pods of balancer and juice-shop (useful to add them into service meshes)
• additionalLabels for ServiceMonitors (useful for adding them to kube-prometheus stack)
• ingressClassName for ingress class

[J12934]

Sorry had some busy weeks, but I saw this PR and will try to take a deeper look in the next couple of days 😊

[J12934]

@zadjadr nice seems to be working really nicely :) Thank you for the PR 🙌

I tweaked the names of the values a bit, moved additionalLabels => just labels, i think this is a bit more consistent with the rest of the chart as we often add things to already existing maps without the additional prefix.

Also added annotations to the service monitors and labels to the pods in case somebody needs it in the future :)