en, zh: del tidb-cluster and tidb-backup in v1.6.0

[srstack]

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• [x] v1.6 (TiDB Operator 1.6 versions)
• [ ] v1.5 (TiDB Operator 1.5 versions)
• [ ] v1.4 (TiDB Operator 1.4 versions)
• [ ] v1.3 (TiDB Operator 1.3 versions)
• [ ] v1.2 (TiDB Operator 1.2 versions)

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Timeline:

• 2024-06-04 06:12:52.814706391 +0000 UTC m=+3361726.571841965: :ballot_box_with_check: agreed by csuzhangxc.

[Oreoxmt]

Please update the base branch for this PR from master to release-1.x, as release-1.x is now the active development branch for TiDB Operator v1.x documentation.