Don't show deleted team on add collaborator form

app/controllers/collaborators_controller.rb

@@ -86,7 +86,7 @@ def find_investigation_from_params
   # rubocop:enable Naming/MemoizedInstanceVariableName
 
   def teams_without_access
-    Team.where.not(id: team_ids_with_access).order(:name)
+    Team.not_deleted.where.not(id: team_ids_with_access).order(:name)
   end
 
   def team_ids_with_access

spec/features/add_team_to_case_spec.rb

@@ -5,6 +5,7 @@
   let(:team)           { create(:team, name: "Southampton Trading Standards", team_recipient_email: "enquiries@southampton.gov.uk") }
   let(:user)           { create(:user, :activated, team: create(:team, name: "Portsmouth Trading Standards"), name: "Bob Jones") }
   let(:investigation)  { create(:allegation, read_only_teams: read_only_team, creator: user) }
+  let!(:deleted_team)  { create(:team, :deleted) }
 
   before do
     read_only_team.update!(name: "Birmingham Trading Standards")
@@ -46,6 +47,10 @@
     expect(page).to have_selector("a", text: "Select the permission level the team should have")
     expect(page).to have_selector("a", text: "Select whether you want to include a message")
 
+    # Check deleted teams are not listed
+    expect(page).to have_css("#team option[value=\"#{team.id}\"]")
+    expect(page).not_to have_css("#team option[value=\"#{deleted_team.id}\"]")
+
     select "Southampton Trading Standards", from: "Choose team"
     choose "Edit full case"
     within_fieldset "Do you want to include instructions or more information?" do