fix: add missing fix for TSO service availability issue when tidb_enable_tso_follower_proxy is enable

[qiancai]

…able_tso_follower_proxy` is enabled

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• This PR is translated from: fix: add missing fix for TSO service availability issue when tidb_enable_tso_follower_proxy is enable docs-cn#20930
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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 master: #21804.