DEV: Remove flaky test for now (#29249)

Adding the directory item test causes the default test to fail randomly due to directory items not getting removed properly.

Removing this for now, and also moving this test to the common system folder instead of system/user_page

spec/system/user_page/users_directory_spec.rb

@@ -1,7 +1,8 @@
 # frozen_string_literal: true
 
-describe "Users /u", type: :system do
+describe "Users directory", type: :system do
   fab!(:user)
+  let!(:initial_directory_events) { [] }
 
   before { Array.new(DirectoryItemsController::PAGE_SIZE + 10) { Fabricate(:user) } }
 
@@ -58,55 +59,4 @@ describe "Users /u", type: :system do
       )
     end
   end
-
-  describe "new directory item" do
-    let!(:plugin) { Plugin::Instance.new }
-    let!(:initial_directory_events) { [] }
-
-    before do
-      initial_directory_events.replace(DiscourseEvent.events["before_directory_refresh"].to_a)
-      DB.exec("ALTER TABLE directory_items ADD COLUMN IF NOT EXISTS links integer")
-    end
-
-    after do
-      DiscourseEvent.events["before_directory_refresh"].delete(
-        (DiscourseEvent.events["before_directory_refresh"].to_a - initial_directory_events).last,
-      )
-      DB.exec("ALTER TABLE directory_items DROP COLUMN IF EXISTS links")
-    end
-
-    it "shows the directory column with the appropriate label" do
-      plugin.add_directory_column(
-        "links",
-        query: "SELECT id, RANDOM() AS random_number FROM users;",
-      )
-      DirectoryItem.refresh!
-      DirectoryColumn.find_by(name: "links").update!(enabled: true)
-
-      sign_in(user)
-
-      visit("/u")
-
-      expect(page).to have_css(".users-directory")
-      expect(page).not_to have_css(".spinner")
-      header_texts =
-        page
-          .all(".directory-table__column-header .header-contents")
-          .map { |element| element.text.strip }
-
-      expect(header_texts).to eq(
-        [
-          "Username",
-          "Received",
-          "Given",
-          "Topics Created",
-          "Replies Posted",
-          "Topics Viewed",
-          "Posts Read",
-          "Days Visited",
-          "Links",
-        ],
-      )
-    end
-  end
 end