WL#10632: MySQL GCS: Update XCom in Group Replication

Affects: Server-8.0   —   Status: Complete 

Since MySQL-GCS development has migrated to mysql main trees, XCom has been 
adapted to also live in the server repository according to server rules of:
- Formatting;
- Types;
- Removal of external references.

The goal of this WL is to bring latest XCom code to the latest version of Group 
Replication.


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