Create test topics on staging's kafka for the mirror tests

• Create the usual swh topics under the swh.test.journal... namespace on the staging's kafka with 16 partitions.

• Provide 2 users:

  • mirror-test-rw for dataset intialisation
  • mirror-test-ro to run the tests

• Provide a set a command lines to manage the topics (reset/recreate/....)

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Migrated from T4265 (view on Phabricator)