CLDC-3501: Remove unfinished LogCreator tests

seems unclear what the test looked to verify, an existing log cannot be created

spec/services/bulk_upload/lettings/log_creator_spec.rb

@@ -153,9 +153,5 @@ RSpec.describe BulkUpload::Lettings::LogCreator do
         expect(log.retirement_value_check).to be(nil)
       end
     end
-
-    context "when valid csv with existing log" do
-      xit "what should happen?"
-    end
   end
 end

spec/services/bulk_upload/sales/log_creator_spec.rb

@@ -151,10 +151,6 @@ RSpec.describe BulkUpload::Sales::LogCreator do
         end
       end
 
-      context "when valid csv with existing log" do
-        xit "what should happen?"
-      end
-
       context "with a valid csv and soft validations" do
         let(:log) do
           build(