[branch-2.1](thrift) fix TLoadTxnBeginRequest backend_id's field no - #39823

[branch-2.1](thrift) fix TLoadTxnBeginRequest backend_id's field no#39823

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yujun777:branch-2.1-fix-TLoadTxnBeginRequestyujun777/doris:branch-2.1-fix-TLoadTxnBeginRequestCopy head branch name to clipboard