Fix legislation proposal crash with SDG enabled

Now we check the given record or name is a relatable instance or class
to avoid trying to render goals for records which don't have a goals
association.

Note for now we are ignoring the case where we pass a controller_path
for an unsupported class (for example, `legislation/proposals` or
`budgets/headings`) because we never use it. We might need to revisit
this case in the future.

Co-Authored-By: Javi Martín <javim@elretirao.net>

spec/models/sdg/process_enabled_spec.rb

@@ -31,6 +31,12 @@ describe SDG::ProcessEnabled do
 
         expect(process).to be_enabled
       end
+
+      it "returns false when record or name are not a relatable type" do
+        expect(SDG::ProcessEnabled.new(build(:legislation_proposal))).not_to be_enabled
+        expect(SDG::ProcessEnabled.new("Legislation::Proposal")).not_to be_enabled
+        expect(SDG::ProcessEnabled.new("officing/booth")).not_to be_enabled
+      end
     end
 
     context "SDG feature is disabled" do