sysadmin/cassandra: Add a missing permission to the reaper user

Related to swh/infra/sysadm-environment#5024 (closed)

changed milestone to %Cassandra in production as primary storage [Roadmap - Tooling and infrastructure]

assigned to @vsellier

approved this merge request

Jenkins job DDOC/builds #418 succeeded .
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added 3 commits

• 11f8cc22...7333736b - 2 commits from branch swh/devel:master
• e6502d5f - sysadmin/cassandra: Add a missing permission to the reaper user

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merged

Jenkins job DDOC/builds #420 succeeded .
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