GAWB-3840: add test to check reader can see published dataset

[ahaessly]

This test won't pass until the new code is merged to dev.

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[davidangb]

1. Holding off on a thumb until it passes in Jenkins (which I realize is dependent on merging the other PR). Maybe just copy this test into the other PR?

2. if/when the all_broad_users is magically kept updated, is it possible that this test will start failing because wsReaderUser is suddenly in that group? You could use demo_users for this test, or even some arbitrary UUID string.

[aweng98]

jenkins retest

[ahaessly]

jenkins retest