Don't create records after a visit in polls tests

Creating records after starting the browser with the `visit` method
sometimes results in database corruption and failing tests on our CI.

Splitting some tests or merging them together solves the issue.

spec/system/polls/polls_spec.rb

@@ -6,23 +6,26 @@ describe "Polls" do
   end
 
   describe "Index" do
-    scenario "Shows description for open polls" do
+    scenario "Shows a no open votings message when there are no polls" do
       visit polls_path
-      expect(page).not_to have_content "Description for open polls"
 
+      expect(page).to have_content "There are no open votings"
+      expect(page).not_to have_content "Description for open polls"
+    end
+
+    scenario "Shows active poll description for open polls when defined" do
       create(:active_poll, description: "Description for open polls")
 
       visit polls_path
+
       expect(page).to have_content "Description for open polls"
 
       click_link "Expired"
+
       expect(page).not_to have_content "Description for open polls"
     end
 
     scenario "Polls can be listed" do
-      visit polls_path
-      expect(page).to have_content("There are no open votings")
-
       polls = [create(:poll, :with_image)] # TODO: generate a list again after switching to zeitwerk
 
       visit polls_path
@@ -84,14 +87,17 @@ describe "Polls" do
       expect(page).not_to have_link("Expired")
     end
 
-    scenario "Displays icon correctly" do
+    scenario "Displays a message asking anonymous users to sign in" do
       create_list(:poll, 3)
 
       visit polls_path
 
       expect(page).to have_css(".not-logged-in", count: 3)
       expect(page).to have_content("You must sign in or sign up to participate")
+    end
 
+    scenario "Displays a message asking unverified users to verify their account" do
+      create_list(:poll, 3)
       user = create(:user)
       login_as(user)
 
@@ -118,6 +124,8 @@ describe "Polls" do
       login_as(create(:user, :level_two))
       visit polls_path
 
+      expect(page).not_to have_css ".already-answer"
+
       vote_for_poll_via_web(poll_with_question, question, "Yes")
 
       visit polls_path
@@ -229,11 +237,7 @@ describe "Polls" do
     end
 
     scenario "Level 1 users" do
-      visit polls_path
-      expect(page).not_to have_css ".already-answer"
-
       poll.update!(geozone_restricted_to: [geozone])
-
       create(:poll_question, :yes_no, poll: poll)
 
       login_as(create(:user, geozone: geozone))