test: fix flake in test_users_with_the_same_batch_id_get_separate_data #1981
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due to _switch_user picking up old test data
Testing
This might slow down
test_users_with_the_same_batch_id_get_separate_data(which is already slow, according to circleci Test Insights, taking up to 90 seconds at least on uuid based batch id spanner/postgres backends).I might log a separate issue to disable this test entirely on those backends, especially if this change adds a significant slowdown, since they shouldn't be generating same batch ids anyway
Issue(s)
Closes STOR-415