[dev-v2.10] rancher-backup support k8s 1.31

[jbiers]

Issue: rancher/rancher#46842

[github-actions]

Validation steps

• Ensure all container images have repository and tag on the same level to ensure that all container images are included in rancher-images.txt which are used by airgap customers.

  Ex:-
    longhorn-controller:
      repository: rancher/hardened-sriov-cni
      tag: v2.6.3-build20230913
  

• Add a 👍 (thumbs up) reaction to this comment once done. CI won't pass without this reaction to the github-action bot's latest validation comment.
• Approve the PR to run the CI check.

[mallardduck]

@jbiers - Looks good overall, however I think this should technically be pulling from head/main and use a 6.x BRO upstream version. So we may just need to create a 6.0.0-rc.1 first in BRO, then point this PR at that as the source.

Have CI running to create now: https://github.com/rancher/backup-restore-operator/actions/runs/10999264305
https://github.com/rancher/backup-restore-operator/releases/tag/v6.0.0-rc.1

[github-actions]

Validation steps

• Ensure all container images have repository and tag on the same level to ensure that all container images are included in rancher-images.txt which are used by airgap customers.

  Ex:-
    longhorn-controller:
      repository: rancher/hardened-sriov-cni
      tag: v2.6.3-build20230913
  

• Add a 👍 (thumbs up) reaction to this comment once done. CI won't pass without this reaction to the github-action bot's latest validation comment.
• Approve the PR to run the CI check.

[mallardduck]

LGMT. Was able to upgrade from 2.9 version of BRO to 2.10 rc fine.