Single OCI registry: Stage 2 - registry cache

[piontec]

Related epics

• Stage 1: #2882
• Stage 3: https://github.com/giantswarm/roadmap/issues/3411
• Retagger changes: https://github.com/giantswarm/roadmap/issues/3068

Tasks

After research and evaluation, we decided to implement per-MC OCI registry cache that will be based on the https://github.com/project-zot/zot

### Tasks
- [ ] https://github.com/giantswarm/roadmap/issues/3066
- [ ] https://github.com/giantswarm/roadmap/issues/3067
- [ ] https://github.com/giantswarm/roadmap/issues/3068
- [ ] https://github.com/giantswarm/roadmap/issues/3069
- [ ] https://github.com/giantswarm/roadmap/issues/3070
- [ ] https://github.com/giantswarm/roadmap/issues/3071
- [ ] https://github.com/giantswarm/roadmap/issues/3116
- [ ] https://github.com/giantswarm/roadmap/issues/3369
- [ ] https://github.com/giantswarm/roadmap/issues/3370
- [ ] https://github.com/giantswarm/roadmap/issues/3436
- [ ] https://github.com/giantswarm/giantswarm/issues/30596
- [ ] https://github.com/giantswarm/roadmap/issues/3460

[weatherhog]

@piontec does this issue still needs to be watched or can it be closed if there is no way forward?

[piontec]

All tasks completed, closing