Add organization record health check

[JackGilmore]

Description

Adds a check to all the organizations listed in datasets to make sure they have an organization record in JKAN

Motivation and Context

Helps us to check for new organizations we're scraping through existing open data portals, as well as discrepancies in organization naming that we need to account for (e.g. variances in "and" vs "&")

How Has This Been Tested?

Ran JKAN locally and visited the platform health page. See screenshot below.

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [X] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [X] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[KarenJewell]

@JackGilmore I've obviously done these PRs in the wrong order, merging was a bit of a headache. I'm happy with changes but could you have a check it works as expected for you with my changes in it first please?

[JackGilmore]

LGTM