Cherry pick hot standby commits from gpdb#1152

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fanfuxiaoran wants to merge 11 commits intoapache:mainfrom

fanfuxiaoran:cherry_pick_hot_standby

Commits on Jun 20, 2025

Enable hot standby dispatch

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fanfuxiaoran
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Revert "Revert "Include distributed xid in transaction commit WAL in all cases""
fanfuxiaoran
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Refactor restore point pausing logic for continuous archive recovery

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fanfuxiaoran
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Add XLOG_LATESTCOMPLETED_GXID

huansong
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fanfuxiaoran
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Support read-committed dtx isolation for hot standby

huansong
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fanfuxiaoran
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Support repeatable-read dtx isolation for hot standby

huansong
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fanfuxiaoran
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Enable upstream hot standby tests

huansong
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fanfuxiaoran
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Make sure query conflict on the standby works as expected

huansong
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fanfuxiaoran
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Fix hot_standby isolation2 and regress tests
fanfuxiaoran
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Generate gp_ view for desired pg_ system views

huansong
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fanfuxiaoran
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Fix system_views_gp.in and fix test query_conflict
fanfuxiaoran
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