Fix slow version queries

[emmachughes]

Fixes the slow query in CA that leads to a timeout when migrating the H5P.NDLAThreeImage stuff.

This is based on earlier work that was done for SaaS, hence the April date on the migrations. That work removed the content_versions table (which had data imported from versionapi) and unused collaboration code in CA (apparently these two had to be removed together). Replacing these tables are parent_id and version_purpose columns on each of the content type tables, with appropriate indexes and foreign key constraints.

The end result is that looking up the migratable resources against the modified h5p_contents now takes a few seconds on my machine, compared to around a minute prior to the change. The version lookup page in CA admin has been updated to reflect these changes.

phpstan failure is a false positive, it passes locally.

[codecov]

Codecov Report

❌ Patch coverage is 90.42553% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.37%. Comparing base (5cefdab) to head (9e55797).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3174      +/-   ##
============================================
+ Coverage     64.19%   68.37%   +4.17%     
+ Complexity     3325     2247    -1078     
============================================
  Files           391      209     -182     
  Lines         14497    10549    -3948     
============================================
- Hits           9307     7213    -2094     
+ Misses         5190     3336    -1854     

Components	Coverage Δ
Content Author	68.37% <90.42%> (-1.29%)	⬇️
Hub	∅ <ø> (∅)

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[chrieinv]

Does not match returned structure