Move ADO image builder backend pipeline to kyma org.

[dekiel]

ADO pipeline for image builder backend for POC purpose exists in neighbors-team organisation. For production usage pipeline and all related files must be located in kyma organisation.

• Create repository in kyma organisation to host pipeline.
• Create new pipeline through hyperspace if needed.
• Try replace bash code for preparing docker auth file with dedicated tasks or python script.
• Add code to new repository using PR flow to ensure proper code review will happen for all parts.

[Sawthis]

@dekiel we should not add links which are not publicly available in the public github. There was such POs agreement. I think better place for this issue is in the corporate github.
CC: @tobiscr