Fix/paranoia soft delete

[alanparmenter]

What github issue is this PR for, if any?

Resolves #6837

What changed, and why?

acts_as_paranoid added toContactTopicAnswer to enable soft deletion. deleted_at column introduced via migration to support this.

How is this tested? (please write rspec and jest tests!) 💖💪

A new test in contact_topic_answer_spec.rb verifies that a ContactTopicAnswer object can be soft-deleted and restored after destruction.

Delete and undelete steps in the UI show that deletion previously removed content permanently, and after the changes the content is restored on undelete.

Screenshots please :)

Before and after screenshot videos from a browser window.

Before.Screen.Recording.2026-04-14.at.14.12.05.mov

After.Screen.Recording.2026-04-14.at.14.38.45.mov

Feelings gif (optional)

[compwron]

Please fix failing spec

  1) /contact_topic_answers POST /create returns the record as json
     Failure/Error:
       expect(response_json.keys)
         .to contain_exactly(:id, :contact_topic_id, :value, :case_contact_id, :created_at, :updated_at, :selected)

       expected collection contained:  [:case_contact_id, :contact_topic_id, :created_at, :id, :selected, :updated_at, :value]
       actual collection contained:    [:case_contact_id, :contact_topic_id, :created_at, :deleted_at, :id, :selected, :updated_at, :value]
       the extra elements were:        [:deleted_at]
     # ./spec/requests/contact_topic_answers_spec.rb:38:in 'block (3 levels) in <top (required)>'
     # ./spec/rails_helper.rb:133:in 'block (2 levels) in <top (required)>'
     # ./spec/rails_helper.rb:118:in 'block (3 levels) in <top (required)>'
     # ./spec/rails_helper.rb:117:in 'block (2 levels) in <top (required)>'
     # ./spec/support/prosopite.rb:56:in 'block (2 levels) in <top (required)>'