feat: add full support for labels and annotations in helm chart

[tuunit]

Motivation

For Operators like ArgoCD or Teleport it is quite useful and sometimes necessary to be able to control and insert annotations and labels into all kinds of resources and especially services.

Furthermore the documentation in the values.yaml was wrong in some places.

• The common labels and annotations aren't applied to all resources.
• Some comments mentioned the wrong resources like "Labels & Annotations for API" despite living in the "Auth" block

Description

• Remove unnecessary templating function common.tpl.renders
• Add new helper function kubernetes-dashboard.annotations to apply common annotations to all resources
• Add common app.labels to helper function kubernetes-dashboard.labels
• Add auth, api, web, and metricsScraper labels and annotation options to all their respective resources
• Add a two new options serviceLabels and serviceAnnotations to auth, api, web, and metricsScraper services

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This pull-request has been approved by: tuunit
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[tuunit]

@desaintmartin @floreks let me know what you think of this change and if I should increase the Chart version as part of this PR