Feature: Report improvements (#6967) (#7000)

* Implement Assignment of Reports (#6967)

* Change translation of admin.report.comment.label to "Report Comment" for clarity

As we'll soon add the ability for reports to have comments on them, this clarification makes sense.

* Implement notes for Reports

This enables moderators to leave comments about a report whilst they work on it

* Fix display of report moderation notes

* Allow reports to be reopened / marked as unresolved

* Redirect to reports listing upon resolution of report

* Implement "resolve with note" functionality

* Add inverse relationship for report notes

* Remove additional database querying when loading report notes

* Fix tests for reports

* Fix localisations for report notes / reports

app/models/report_note.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+# == Schema Information
+#
+# Table name: report_notes
+#
+#  id         :integer          not null, primary key
+#  content    :text             not null
+#  report_id  :integer          not null
+#  account_id :integer          not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+
+class ReportNote < ApplicationRecord
+  belongs_to :account
+  belongs_to :report, inverse_of: :notes
+
+  scope :latest, -> { reorder('created_at ASC') }
+
+  validates :content, presence: true, length: { maximum: 500 }
+end