server: deprecate GEO partition & related variables
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type/enhancement
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Description
## Enhancement
TiDB used to develop some part of GEO partition and cross region deployment and introduce serveral system variables. There is no maintain and release plan in the future, it would be deprecated in the future and related code would be removed.
Current, including:
- Variable [`txn_scope`](https://docs.pingcap.com/tidb/stable/system-variables#txn_scope)
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