Finalize solr reindex

[cdrini]

Closes #8234

Puts an end to the stage of our solr stuck on the staging server! These are the settings that were used to run the solr reindex. Some of the features in the issue aren't correctly there because of how bumpy this reindex was, and might require another full reindex :(

Technical

• Increased some timeout for solr requests; was noticing a few things timing out during solr updater runs
• Switched lists solr updater to use POST to avoid url too long errors
• Remove if solr_next wrappers
• Reduce frequency of solr haproxy health checks to match our other services

Testing

Screenshot

Stakeholders