branch-4.1: [fix](cloud) Prevent old clients from decoding unknown MetaServiceCode as OK (#64148) - #66353
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branch-4.1: [fix](cloud) Prevent old clients from decoding unknown MetaServiceCode as OK (#64148)#66353wyxxxcat wants to merge 1 commit into
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…e as OK (apache#64148) Problem Summary: Older BE versions may treat unknown meta service enum codes as OK under proto2 semantics. Add a request capability marker so MS only returns MS_TOO_BUSY to BE versions that can handle it, and downgrade otherwise. - Behavior changed: Yes (MS_TOO_BUSY is returned only when the BE request declares support; legacy requests receive KV_TXN_CONFLICT instead)
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pick: #64148