Solr: reconfiguration needed in Heroku environment

[jnga]

The upgrade done with #683 left off with Solr still working in Dev after deploying the project, but the new schema.xml and solrconfig.xml appear not to be reloaded correctly, resulting in a Provisioning Error in Heroku's WebSolr. Starting with Dev, fix this. Likely need extra Heroku permission to de-provision the WebSolr slice and try to re-create it. WebSolr support has been unresponsive to two inquiries, and they have not been active on Twitter since last fall, so it is unclear if this service is still being actively maintained.

[jnga]

This might be for Release 3.2, or later. It seems as if it will require re-provisioning the WebSolr Heroku add-on in order to get new schema.xml and solrconfig.xml versions to load correctly. The current version of the add-on is discontinued and appears to only be running as a "legacy" product. Discussion w/SK needed.

[jnga]

This Solr reconfiguration might best be postponed until the upcoming Heroku stack upgrade (due before May 1, 2020).