DAOS-16374 vos: integer overflow on evt recx trace (#15439)

[gnailzenh]

The evt recx trace is used for vos aggregation debugging, and it's currently reset on akey iteration callback, but the akey iteration callback could be skipped in some cases, for example, when evt aggregation hit an aborted recx, it'll start over in evtree level without the recx trace reset, that could lead to integer overflow on the 'int ap_trace_count'.

This patch moved the ap_trace_count reset to merge window open/close to ensure the evt recx trace always being reset properly.

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[github-actions]

Ticket title is 'control/config_generate_output.py and control/config_generate_run.py tests are failing to start the daos servers with sudo command.'
Status is 'Resolved'
Labels: 'ci_master_weekly'
https://daosio.atlassian.net/browse/DAOS-16374

[daosbuild1]

Test stage NLT on EL 8.8 completed with status UNSTABLE. https://build.hpdd.intel.com/job/daos-stack/job/daos//view/change-requests/job/PR-15533/1/testReport/