🧹 Rename image_form_spec to reflect decoration

[jeremyf]

Prior to this commit the Knapsace image_form_spec had a test for terms
that was not part of the Hyku. We introduce these differences through our
decoration in ./app/forms/hyrax/image_form_decorator.rb

To reflect the existence of the decorator and not have a duplicate file
that future us would need to synchronize with Hyku, I've moved the file
and winnowed it down to reflect the specific changes.

I also needed to add three new properties to the spec as it reflects
upstream changes in Hyku (e.g. access_right alternative_title
rights_notes)

Diff of filein Hyku and Knapsack

❯ diff spec/forms/hyrax/image_form_spec.rb hyrax-webapp/spec/forms/hyrax/image_form_spec.rb
27,44d26
<   describe '.terms' do
<     it 'returns an array of inherited and custom terms' do
<       expect(described_class.terms.sort).to eq(
<         %i[
<           title creator contributor description keyword abstract
<           license rights_statement publisher date_created
<           subject language identifier based_near related_url
<           representative_id thumbnail_id rendering_ids files
<           visibility_during_embargo embargo_release_date visibility_after_embargo
<           visibility_during_lease lease_expiration_date visibility_after_lease
<           visibility ordered_member_ids source in_works_ids member_of_collection_ids
<           admin_set_id resource_type extent aark_id part_of place_of_publication
<           date_issued alt bibliographic_citation remote_url
<         ].sort
<       )
<     end
<   end
<

Related to:

• ☄️ Epic: Failing Specs #324