Upgrade msul-main to Avalon v7.8

upgrade msul-main to avalon 7.8

current test status - the homepage spec is fixed via kyle/fix_tests branch. The other two appear to be failing on avalon branch as well.

Finished in 581 minutes 21 seconds (files took 18.03 seconds to load)
2413 examples, 6 failures, 51 pending

Failed examples:

rspec ./spec/features/capybara_homepage_spec.rb:50 # checks navigation to external links checks navigation to Avalon Website
rspec ./spec/features/capybara_homepage_spec.rb:54 # checks navigation to external links checks navigation to Contact us page
rspec ./spec/features/capybara_homepage_spec.rb:66 # checks navigation to external links verifies presence of features after login
rspec ./spec/features/capybara_navigation_spec.rb:26 # checks navigation after logging in checks navigation to Manage Content
rspec ./spec/jobs/bulk_action_job_spec.rb:129 # BulkActionJobs::ApplyCollectionAccessControl perform with cdl disabled does not change item lending period or other fields
rspec ./spec/models/media_object_spec.rb:814 # MediaObject#physical_description should not return nil physical descriptions