WIP Dataset Filter Test

[kducharm]

Connects #2103

Description

Please write any background information about this PR you think is useful for the product team.

User story

If this PR introduces new functionality, include a user story or stories describing what this pull request is intended for.

How to reproduce

1. If the PR fixes a bug, include instructions for reproducing the bug on a current DKAN release.

QA Steps

• Add manual QA steps in checklist format for a reviewer to perform to confirm that the feature or fix is working. Include as much details as possible so that the reviewer doesn't lose time figuring out how to perform steps.

Merge process

• Note if there is a special sequence for merging (such as PRs on other repos that need to be merged first) or other abnormalities to look out for.

Reminders

• There is test for the issue.
• CHANGELOG updated.
• Coding standards checked.
• Review docs.getdkan.com (or in /docs) to see if it still covers the scope of the PR and update if needed.