[che-operator] Productize new backup-rhel8 container - required for support of backup/restore

Productization requirements:

• Upstream sources: https://github.com/che-dockerfiles/che-backup-server-rest
• Upstream image: quay.io/eclipse/che-backup-server-rest:eeacd92

• add branch creation every 3 weeks (tied to Che releases) so we can productize from a stable branch/commit, rather than tip of the main branch - see https://github.com/eclipse-che/che-release/blob/main/make-release.sh#L204

• new comet build entry ==> pkgs.devel repo - see https://github.com/redhat-developer/codeready-workspaces-productization/blob/crw-2-rhel-8/devdoc/building/osbs-container-builds.adoc#gaining-access
• new comet dellivery entry ==> RHEC url (make sure added to the correct errata targets/branches) - https://github.com/redhat-developer/codeready-workspaces-productization/tree/crw-2-rhel-8/devdoc/publishing#non-operator-container

• new folder in crw-images repo to contain sources transformed/synced from upstream
• new sync.sh script to handle sync logic (upstream -> midstream)
• new get-sources.sh script to handle fetching any third party deps not able to be synced (or vendored) directly in the source tree
• implement Jenkins job to build in 2.11 and 2.x branches

• include container in scripts getLatestImageTags.sh, tagRelease.sh, and manifest/get-3rd-party-deps-manifests.sh

• create image in quay https://quay.io/repository/crw/backup-rhel8 and set correct owners/creators permissions so humans and bots can push content
• add to build-all-images job so it can be rebuilt weekly, in the correct sequence based on dependencies (parents, children)
• update deployment yaml in 2.11 and 2.x branches (see codeready-workspaces-operator/build/scripts/sync*.sh) to replace this:

•             - name: RELATED_IMAGE_internal_rest_backup_server
                value: quay.io/eclipse/che-backup-server-rest:eeacd92
  

  with

              - name: RELATED_IMAGE_internal_rest_backup_server
                value: registry.redhat.io/codeready-workspaces/backup-rhel8:2.11
  

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https://github.com/eclipse/che/issues/18703

Is your task related to a problem? Please describe.

To support level 3 of the operator framework capability levels che-operator should provide the ability to create backups/restore of the Operand.

Additional context

#18043