Reconsider whether all STLA 2PC methods need context associating (for TXOJ)

All of the ServerTopLevelAction 2PC methods have local context association commented out, since it's not strictly needed in the JTS (a Resource is implicitly associated with a single transaction). It's not invalid either though, but we commented it out years ago. It's been added back for the rollback method. Check to see if it needs to be added back to all methods for consistency.

May be needed for distributed STM.