[ESSI-875] bulkrax 5 upgrade

[aploshay]

Upgrades from bulkrax 1.0.2 to 5.5.1.

Work and FileSet ingest is working in my local environment, with some outstanding issues.

Known Issues:

• ** FileSet <-> Work association**: The various import jobs aren't being sequenced to run in the necessary order (at least, in my local environment), so I'm finding I have to run the importer once to get the works created (with all the FileSets failing), then re-run it to create all the FileSets. See [bulkrax issue #955](importer tries, fails to create FileSets before Works are persisted (tested in 5.5.1, 7.0.0) samvera/bulkrax#955)~
• ** Collection creation/association**: I haven't had success ingesting to create a new Collection, or to associate to an existing one -- but I only tried this lightly, and it might be issues of configuration and/or CSV content.
• METS XML import: dropped, as it is based on XML import, which isn't supported in newer version of bulkrax
• Ingested nested Works within Works: works, but doesn't display in UI, but that's really a separate issue
• Exporting: metadata export works, but with access concerns, access restricted to admins and managers, and file export prevented (isn't working, and we don't want it done, anyway)

Temporarily skipped tests:

• Feature spec for CSV ingest
• METS XML Entry model spec (parser is still tested)

Regarding configuration change label:

• requires running database migrations
• may also require (or benefit from) TBD config changes to bulkrax

Notes on running locally:

• make sure to run a db:migrate to pick up the bulkrax changes -- the rails server will run without complaint when the migrations are coming from a gem, unlike when they are directly in the repo and it hard stops and tells you to migrate
• you may run into some issues spinning up the branch; ask me if I had the same problem and what I did to work around it

[dlpierce]

Looks good by visual inspection.
The downgrade of sidekiq is probably a good thing. While nothing seemed broken, it does warn that sidekiq 7 is not supported on this old stack.