Move content_tagging django app so that CMS-only tests run

[rpenido]

Description

This PR moves the content_tagging from openedx/features/ to openedx/core/djangoapps/content_tagging the tagging REST API for creating/updating object tags in Courses and XBlocks.

Supporting Information

• More info on: feat: add language auto-tagging #32907 (comment)

Testing instructions

• Ensure that the tests cover content_tagging in the openedx-4 shard.

---

Private ref: FAL-3500

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[ChrisChV]

@rpenido Looks good.

• I read through the code
• I ran the tests locally
• I checked the test on the CI

[rpenido]

Hi @bradenmacdonald!

This is ready for your review!

[openedx-webhooks]

@rpenido 🎉 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.

[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.