[azure-resourcemanager-exporter] feat: add vpa support

[t3mi]

What this PR does / why we need it

This PR adds support the the vertical pod autoscaler so users do not have to care about the resource usage of the azure-resourcemanager-exporter and let the vertical pod autoscaler to do its job.
Also, fixes invalid value ref to existing config map key and whitespaces in labels.

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

Special notes for your reviewer

Checklist

• Chart Version bumped
• Title of the PR starts with chart name (e.g. [azure-metrics-exporter])

[t3mi]

@mblaschke any chance you could review opened PRs?

[mblaschke]

@t3mi

i would remove (.Capabilities.APIVersions.Has "autoscaling.k8s.io/v1") from the if clause. this would lead to a failed deployment if this apiversion is not available instead of just ignoring VPA.
this would give the user direct feedback that something is wrong.
what do you think?

[t3mi]

@mblaschke capability check was removed.