Add polygon geographies to Budgets' map

Note that in the budgets wizard test we now create district with no
associated geozone, so the text "all city" will appear in the districts
table too, meaning we can't use `within "section", text: "All city" do`
anymore since it would result in an ambiguous match.

Co-Authored-By: Julian Herrero <microweb10@gmail.com>
Co-Authored-By: Javi Martín <javim@elretirao.net>

spec/factories/administration.rb

@@ -8,10 +8,19 @@ FactoryBot.define do
     sequence(:name) { |n| "District #{n}" }
     sequence(:external_code, &:to_s)
     sequence(:census_code, &:to_s)
+    color { "#0081aa" }
 
     trait :in_census do
       census_code { "01" }
     end
+
+    trait :with_html_coordinates do
+      html_map_coordinates { "30,139,45,153,77,148,107,165" }
+    end
+
+    trait :with_geojson do
+      geojson { '{ "geometry": { "type": "Polygon", "coordinates": [[-0.117,51.513],[-0.118,51.512],[-0.119,51.514]] } }' }
+    end
   end
 
   factory :banner do