(fix ci) Fix search journal client tests
This:
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tests: drop the now broken MockedKafkaConsumer test class
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migrate the journal client test to pytest (it would not accept to inject fixtures otherwise)
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fixes the ci [1]
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[1] https://jenkins.softwareheritage.org/job/DSEA/job/tests/266/console
Related to swh-indexer!235 (closed)
Test Plan
tox
Migrated from D3151 (view on Phabricator)