config-updater: treat main branches as master

[petr-muller]

There will be more and more main branches incoming (main being the
new defaults for new GH repos) so this is an attempt to just cover them
all.

Also remove the repo-specific stanzas that the new one should replace.

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: petr-muller, stevekuznetsov

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• core-services/prow/02_config/OWNERS [petr-muller,stevekuznetsov]

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[openshift-ci-robot]

@petr-muller: Updated the following 2 configmaps:

• plugins configmap in namespace ci at cluster app.ci using the following files:
  • key plugins.yaml using file core-services/prow/02_config/_plugins.yaml
• plugins configmap in namespace ci at cluster api.ci using the following files:
  • key plugins.yaml using file core-services/prow/02_config/_plugins.yaml

Details

In response to this:

There will be more and more main branches incoming (main being the
new defaults for new GH repos) so this is an attempt to just cover them
all.

Also remove the repo-specific stanzas that the new one should replace.

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