Remove Taxonomy.required, make allow_multiple True by default [FC-0030]

[bradenmacdonald]

Part of openedx/modular-learning#85 , follows #87 .

This removes the Taxonomy.required field which we don't really need and isn't in the UX designs.

It also makes allow_multiple True by default since all user-created taxonomies will need to allow multiple tags and for the MVP we don't plan on implementing any way for users to change Taxonomies to not allow multiple tags.

It also removes the language tags fixture because language tags are now auto-created as needed when the system goes to tag something by language. And because removing the required field made the fixture stop working in its migration.

There is a corresponding edx-platform PR as well: openedx/openedx-platform#33438

Private-ref: FAL-3477

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[pomegranited]

I left a couple of minor nits, but this is good to merge once they're addressed.

Oh and we probably need a version bump?

Thanks @bradenmacdonald !

👍

• I tested this by installing this branch on my devstack, and ensuring that the added migrations update ok from main.
• I read through the code
• I checked for accessibility issues N/A
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• Commit structure follows OEP-0051

[ChrisChV]

@bradenmacdonald Looks good 👍 Thanks!

[bradenmacdonald]

Thanks for the reviews!

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