DAOS-14908 vos: Object level mutual exclusion only

[jolivier23]

Now that we have support for object level mutual exlusion between aggregation, discard, and object discard, let's remove the global mutual exclusion from these processes

Features: rebuild ec reintegration

Required-githooks: true

Before requesting gatekeeper:

• Two review approvals and any prior change requests have been resolved.
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• Any tests skipped by the ticket being addressed have been run and passed in the PR.

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[github-actions]

Ticket title is 'soak - online harassers with 2.4.1-2 - rebuild took over 30 minutes to complete'
Status is 'In Progress'
Labels: '2.4.2rc1,2.6.0,2.6.0tb1,scrubbed,soak,triaged'
https://daosio.atlassian.net/browse/DAOS-14908

[daosbuild1]

Test stage Functional on EL 8.8 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-14354/2/execution/node/1202/log