Update CircleCI configuration for pushing to container registries

[marians]

Towards giantswarm/roadmap#2979

This PR was created through automation by Team Honeybadger, to make sure that the container images built for this repository are available in the right registries.

For that, the CircleCI configuration is modified to use the new push-to-registries job instead of the old push-to-docker. This means that there is only one job for all registry pushes, and it simplifies the configuration by removing many parameters that are now set automatically or as defaults.

Notes

• Since the PR is also changing the CircleCI job name to push-to-registries, the branch protection rules in this repository will likely require updating before the required checks can be green.
• Dev images are sent to ACR (gsoci.azurecr.io) and Quay currently. If you need dev images elsewhere, you can add the according configuration as described in the documentation to the step configuration.

To the responsible team

Please,

• Double-check the job dependecies (requires).
• Double-check the job filters. Especially if this PR replaces several jobs with one, and the previous jobs had different filters, make sure that the filter includes all cases.
• Update the changelog if you think this deserves a mention.
• Approve and merge this PR once it's ready. No need to wait for the author in this case.
• Get this done until 1st of December, so that we can move on with follow-up steps.

[marians]

@piontec Can you please take a look here?

Circular job dependency detected: "run-tests" -> "push-to-registries" -> "augment-circleci-dockerfile" -> "push-to-registries"

[marians]

@piontec Could you take a look here please?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8e60c73) 74.75% compared to head (aa1c189) 74.75%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #294   +/-   ##
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  Coverage   74.75%   74.75%           
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  Files          11       11           
  Lines         721      721           
  Branches      107      107           
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  Hits          539      539           
  Misses        123      123           
  Partials       59       59           

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