Remove system-defined taxonomies, CONTENT_TAGGING_AUTO

[bradenmacdonald]

Description

This PR, along with openedx/openedx-core#654 (which must merge first), will:

• Remove "system defined" taxonomies. The only one was the "Languages" taxonomy and we don't believe anyone was using it. However, if someone was using it, it will be converted to a regular taxonomy and continue to work.
• Remove the "auto tagging" feature that tags every XBlock with the language of the parent course. This was another half-baked feature and its waffle flag was off by default. I don't believe anyone ever used it.
• Implements the "read_only" flag for taxonomies, which makes their tags not editable in the UI (other metadata continues to be editable).
• Improves some tests and fixes some flakiness
• Fixes what seems like a major issue in the API: the tag_object API would silently fail if the taxonomy was not enabled for the org that owns the content you are trying to tag. As a result, a couple of test cases were not even testing what they thought, because the tags never got created in the first place.

Supporting information

Implements openedx/openedx-core#634

Testing instructions

Verify that the taxonomy editor and content tagging features are working as normal.

Sandbox: https://studio.pr-38895-885846.axim-sandboxes.opencraft.hosting/

Deadline

None

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[openedx-webhooks]

Thanks for the pull request, @bradenmacdonald!

This repository is currently maintained by @openedx/wg-maintenance-openedx-platform.

Once you've gone through the following steps feel free to tag them in a comment and let them know that your changes are ready for engineering review.

🔘 Get product approval

If you haven't already, check this list to see if your contribution needs to go through the product review process.

• If it does, you'll need to submit a product proposal for your contribution, and have it reviewed by the Product Working Group.
  • This process (including the steps you'll need to take) is documented here.
• If it doesn't, simply proceed with the next step.

🔘 Provide context

To help your reviewers and other members of the community understand the purpose and larger context of your changes, feel free to add as much of the following information to the PR description as you can:

• Dependencies

  This PR must be merged before / after / at the same time as ...

• Blockers

  This PR is waiting for OEP-1234 to be accepted.

• Timeline information

  This PR must be merged by XX date because ...

• Partner information

  This is for a course on edx.org.

• Supporting documentation
• Relevant Open edX discussion forum threads

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Details

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Where can I find more information?

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When can I expect my changes to be merged?

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💡 As a result it may take up to several weeks or months to complete a review and merge your PR.

[bradenmacdonald]

This was renamed from test_tasks.py. Most of the code was existing code, but I removed all the tests related to auto-tagging and only left in the tests related to auto-deleting tags when the content gets deleted.