cdc: remove mention about force-replicate

[qiancai]

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• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
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• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
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What is the related PR or file link(s)?

• This PR is translated from: cdc: remove mention about force-replicate docs-cn#18936
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• Delete files
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• Might cause conflicts after applied to another branch

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[qiancai]

/approve

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #19264.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #19265.