check-before-deployment: add selinux

[dveeden]

See also:

• https://docs.pingcap.com/tidb/stable/deploy-a-dm-cluster-using-tiup
• https://docs.pingcap.com/tidb/stable/tiup-component-cluster-check#selinux

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Timeline:

• 2024-12-16 13:50:40.931127947 +0000 UTC m=+878431.019930490: ☑️ agreed by hfxsd.