DAOS-16931 container: fix oid iv race with using invalid on update pt…

[mchaarawi]

…r (#15714)

the src pointer for on_update() callback is on the stack and should not be saved beyond that call to detect the same request, because in some cases we can end up with 2 different requests sharing getting the same pointer value. Use the private pointer allocated by the oid iv on_get operation instead.

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[github-actions]

Ticket title is 'oid IV assertion on server with mutex unlock'
Status is 'Open'
Labels: 'request_for_2.6.3,triaged'
https://daosio.atlassian.net/browse/DAOS-16931