Remove reindex_library command and legacy library search index infrastructure

[bradenmacdonald]

Description

We no longer support viewing/editing legacy libraries, only exporting them or migrating them to v2 content libraries.

However, there is still a bunch of code related to indexing legacy libraries in the search index. The continued existence of the reindex_library command in particular was confusing, as it doesn't do what you'd expect (it has no useful effect, since it's a legacy command and legacy library indexes are not exposed anywhere in the system anymore; the correct command to update content libraries is reindex_studio).

Supporting information

Part of the Deprecate and Remove Legacy Libraries epic, although a specific task for search index hadn't been identified as a requirement yet.

Testing instructions

Verify that the v2 library UI continues to refresh when you make changes to library content (the search index gets updated as you make edits), and that the tutor dev exec cms ./manage.py cms reindex_studio command is unaffected and can run and complete the indexing as normal.

Deadline

None

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Private ref MNG-5003

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[samuelallan72]

@bradenmacdonald 👍 thanks, looks good to me!

• I tested this: followed test instructions
• I read through the code
• I checked for accessibility issues
• Includes documentation