adding the azurelinux node pool to test plum

[ConnorOKane-Kainos]

Jira link - https://tools.hmcts.net/jira/browse/DTSPO-18233

Change description

Testing plum using the new Azure Linux nodepool that we have created here - https://github.com/hmcts/aks-cft-deploy/blob/83f42d1098c4e94eba960413dd738ba42507c2af/components/aks/aks.tf

Checklist

• [x] commit messages are meaningful and follow good commit message guidelines
• [x] README and other documentation has been updated / added (if needed)
• [ ] tests have been updated / new tests has been added (if needed)
• [ ] Does this PR introduce a breaking change

🤖AEP PR SUMMARY🤖

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• Updated sbox.yaml in apps/cnp/plum-batch:
  • Removed tolerations for spot instances and updated nodeSelector to use azurelinux agent pool.
  • Schedule was not changed.