improve-access-dashboard

[yiduoyunQ]

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fix issues #2047

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• master (the latest development version)
• 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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[qiancai]

Removed the needs-cherry-pick-release-1.1 label because the v1.1 docs have been archived at https://docs-archive.pingcap.com/zh/tidb-in-kubernetes/v1.1 and will no longer receive new updates.

[qiancai]

Removed the needs-cherry-pick-release-1.2 label because the v1.2 docs have been archived at https://docs-archive.pingcap.com/zh/tidb-in-kubernetes/v1.2/ and will no longer receive new updates.