Users cannot create new tags

[xiphl]

Describe the bug
I wanted a setup where

1. ordinary dataset users who are dataowners can edit any aspect of a dataset except edit dataset ownership (due to having custom code checking on ownership status giving owners some additional functionality). This include adding new tags to a dataset.
2. Dataset owners can do anything to their own datasets.
3. I don't want to add dataowners to any groups, so none of the users are in a group, only have CorpUser entries.

What I got instead:

1. users and dataset owners cannot introduce new tags to a dataset, encountering the "Failed to create & add tag: Unauthorized to perform this action. "error message. only platform admin datahub can do so. There are no issues for both users and owners to add existing tags to a dataset.

To Reproduce
Steps to reproduce the behavior:

1. Git cloned the latest repo (as of 12 hours ago), launched datahub with existing docker volumes. I had CorpUsers ingested previously so am able to assign owners to datasets
2. included the following policies:

• overview:

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• policies in bold (non-default policies):

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Expected behavior
Everyone should be able to add NEW tags.

[xiphl]

tested and solved!

[jjoyce0510]

Thank you!