FIX: new chat from url flaky fix (#27414)

The order of chat direct message groups can sometimes place usernames in an unexpected order, this change tests multiple combinations of usernames and accepts them no matter what order they are in.

plugins/chat/spec/system/chat_new_message_spec.rb

@@ -14,6 +14,10 @@ RSpec.describe "Chat New Message from params", type: :system do
     sign_in(current_user)
   end
 
+  def group_slug(users)
+    users.pluck(:username).permutation.map { |u| u.join("-") }.join("|")
+  end
+
   context "with a single user" do
     it "redirects to existing chat channel" do
       chat_page.visit_new_message(user_1)
@@ -42,9 +46,10 @@ RSpec.describe "Chat New Message from params", type: :system do
 
     it "loads existing dm channel when one exists" do
       expect { chat_page.visit_new_message([user_1, user_2]) }.not_to change { Chat::Channel.count }
-      users = [user_1.username, user_2.username].permutation.map { |u| u.join("-") }.join("|")
 
-      expect(page).to have_current_path(%r{/chat/c/(#{users})/#{group_dm.id}})
+      expect(page).to have_current_path(
+        %r{/chat/c/(#{group_slug([user_1, user_2])})/#{group_dm.id}},
+      )
     end
 
     it "creates a dm channel when none exists" do
@@ -53,7 +58,7 @@ RSpec.describe "Chat New Message from params", type: :system do
       )
 
       expect(page).to have_current_path(
-        "/chat/c/#{user_1.username}-#{user_3.username}/#{Chat::Channel.last.id}",
+        %r{/chat/c/#{group_slug([user_1, user_3])}/#{Chat::Channel.last.id}},
       )
     end