cleanup image builder mk2

[iQQBot]

Description

From #7086 it remove image builder mk2, but not clean
The reason it works is that the values under werft have not been modified

Note that the ops may need to be modified before merging

Related Issue(s)

Fixes #

How to test

Release Notes

NONE

Documentation

[roboquat]

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Associated issue: #7086

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[iQQBot]

Ready for review

[csweichel]

I actually deliberately decided not to do this kind of cleanup, because the helm-chart is on the way out. I'd fret that by trying to cut this out nicely, we might inadvertently break production because of the intricacies of the helm chart.

I was far from clear enough in stating that, but it's what I meant with:

The helm chart remains backwards compatible, the installer never deployed mk2.

[iQQBot]

This PR is actually designed to provide compatibility, because the imageBuilder configuration item has been removed from value.yaml in #7086, and the template (like image-builder-mk3-configmap.yaml) relies on this configuration

{{ $compImgbldr := .Values.components.imageBuilder -}}

cc @csweichel close this PR