Apply Layout/LineLength rubocop rule

Note we're excluding a few files:

* Configuration files that weren't generated by us
* Migration files that weren't generated by us
* The Gemfile, since it includes an important comment that must be on
  the same line as the gem declaration
* The Budget::Stats class, since the heading statistics are a mess and
  having shorter lines would require a lot of refactoring

spec/components/admin/budget_headings/form_component_spec.rb

@@ -26,7 +26,8 @@ describe Admin::BudgetHeadings::FormComponent do
 
       render_inline component
 
-      expect(page).to have_select "Scope of operation", options: ["All city", "Under the sea", "Above the skies"]
+      expect(page).to have_select "Scope of operation",
+                                  options: ["All city", "Under the sea", "Above the skies"]
     end
   end
 end

spec/components/admin/geozones/index_component_spec.rb

@@ -6,7 +6,9 @@ describe Admin::Geozones::IndexComponent, :admin do
       geozones = [
         create(:geozone, :with_geojson, name: "GeoJSON", external_code: "1", census_code: "2"),
         create(:geozone, :with_html_coordinates, name: "HTML", external_code: "3", census_code: "4"),
-        create(:geozone, :with_geojson, :with_html_coordinates, name: "With both", external_code: "6", census_code: "7"),
+        create(:geozone, :with_geojson, :with_html_coordinates, name: "With both",
+                                                                external_code: "6",
+                                                                census_code: "7"),
         create(:geozone, name: "With none", external_code: "8", census_code: "9")
       ]
 

spec/components/admin/site_customization/pages/index_component_spec.rb

@@ -1,6 +1,7 @@
 require "rails_helper"
 
-describe Admin::SiteCustomization::Pages::IndexComponent, controller: Admin::SiteCustomization::PagesController do
+describe Admin::SiteCustomization::Pages::IndexComponent,
+         controller: Admin::SiteCustomization::PagesController do
   before { SiteCustomization::Page.delete_all }
 
   it "shows date in created_at and updated_at fields" do