Dev: --dev option does nothing in yarn (#12032)

.github/workflows/ci.yml

@@ -119,7 +119,7 @@ jobs:
             ${{ runner.os }}-${{ matrix.os }}-yarn-
 
       - name: Yarn install
-        run: yarn install --dev
+        run: yarn install
 
       - name: "Checkout official plugins"
         if: env.TARGET == 'PLUGINS'

lib/tasks/qunit.rake

@@ -26,7 +26,7 @@ task "qunit:test", [:timeout, :qunit_path] do |_, args|
 
   report_requests = ENV['REPORT_REQUESTS'] == "1"
 
-  system("yarn install --dev")
+  system("yarn install")
 
   # ensure we have this port available
   def port_available?(port)

lib/tasks/smoke_test.rake

@@ -16,7 +16,7 @@ task "smoke:test" do
     abort "Chrome 59 or higher is required to run tests in headless mode."
   end
 
-  system("yarn install --dev")
+  system("yarn install")
 
   url = ENV["URL"]
   if !url