openshift-loki: Remove obsolete loki upstream branches and mirroring

[periklis]

Refs: LOG-5504

/cc @xperimental @JoaoBraveCoding

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@periklis: no rehearsable tests are affected by this change

[deepsm007]

/lgtm

[JoaoBraveCoding]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deepsm007, JoaoBraveCoding, periklis

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• ci-operator/config/openshift/loki/OWNERS [deepsm007,periklis]
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[openshift-ci]

@periklis: Updated the image-mirror-mappings configmap in namespace ci at cluster app.ci using the following files:

• key mapping_logging_loki_quay using file core-services/image-mirroring/openshift-logging/mapping_logging_loki_quay

In response to this:

Refs: LOG-5504

/cc @xperimental @JoaoBraveCoding

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