DAOS-17148 common: btree delete may move target out of boundary

[Nasf-Fan]

During btr_node_del_rec(), if the record to be deleted from current node is the last one, the logic will try to migrate one record from its sibling node. If current node is at the tail position in parent node, original logic may migrate an invalid record from a non-exist sibling node on the right. That may cause kinds of corruption since the content in such invalid record is undefined.

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[github-actions]

Ticket title is 'Aurora daos_user: One of the server got crashed after pool reinit'
Status is 'Open'
Labels: 'ALCF'
https://daosio.atlassian.net/browse/DAOS-17148

[daosbuild1]

Test stage Unit Test bdev with memcheck on EL 8.8 completed with status UNSTABLE. https://build.hpdd.intel.com/job/daos-stack/job/daos//view/change-requests/job/PR-15950/3/testReport/

[daosbuild1]

Test stage Unit Test on EL 8.8 completed with status UNSTABLE. https://build.hpdd.intel.com/job/daos-stack/job/daos//view/change-requests/job/PR-15950/3/testReport/

[daosbuild1]

Test stage Unit Test with memcheck on EL 8.8 completed with status UNSTABLE. https://build.hpdd.intel.com/job/daos-stack/job/daos//view/change-requests/job/PR-15950/3/testReport/