Simplify Tag Models [FC-0030]

[bradenmacdonald]

Description

This PR goes along with openedx/openedx-learning#87 and makes some simplifications and clean ups to the "content tagging" app.

Interestingly, I didn't have to change the views or test_views at all - those tests are all still passing with no changes.

Note: it is now a bit safer to edit these models in the Django admin, because ObjectTag now has a clean() method which performs some basic validation.

Supporting information

Issue: openedx/modular-learning#85

Testing instructions

For now just run the test suite; this app doesn't have a UI yet.

Deadline

None

Private-ref: FAL-3477

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[ChrisChV]

@bradenmacdonald Looks good 👍

• I tested this runing the test.
• I read through the code.
• Includes documentation

[Agrendalath]

Nice cleanup 👍

• I tested this: checked that the CI is passing
• I read through the code
• I checked for accessibility issues: n/a
• Includes documentation: n/a
• I made sure any change in configuration variables is reflected in the corresponding client's configuration-secure repository: n/a

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@bradenmacdonald 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.