Remove Webpack dev servers for Boards/Playbooks (#23378)

* Add option to run web app build without dev servers

* Completely remove product dev servers

* Update unit test

* Fix another test

server/channels/web/handlers_test.go

@@ -449,7 +449,7 @@ func TestHandlerServeCSPHeader(t *testing.T) {
 		response := httptest.NewRecorder()
 		handler.ServeHTTP(response, request)
 		assert.Equal(t, 200, response.Code)
-		assert.Equal(t, []string{"frame-ancestors 'self'; script-src 'self' cdn.rudderlabs.com js.stripe.com/v3 'unsafe-eval' 'unsafe-inline' http://localhost:9006 http://localhost:9007"}, response.Header()["Content-Security-Policy"])
+		assert.Equal(t, []string{"frame-ancestors 'self'; script-src 'self' cdn.rudderlabs.com js.stripe.com/v3 'unsafe-eval' 'unsafe-inline'"}, response.Header()["Content-Security-Policy"])
 	})
 
 }
@@ -472,7 +472,7 @@ func TestGenerateDevCSP(t *testing.T) {
 
 		devCSP := generateDevCSP(*c)
 
-		assert.Equal(t, " 'unsafe-eval' 'unsafe-inline' http://localhost:9006 http://localhost:9007", devCSP)
+		assert.Equal(t, " 'unsafe-eval' 'unsafe-inline'", devCSP)
 	})
 
 	t.Run("allowed dev flags", func(t *testing.T) {