Not skiping tests on commands, and removing unnecesary main_test.go files (#14032)

plugin/main_test.go

@@ -1,22 +0,0 @@
-// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
-// See LICENSE.txt for license information.
-
-package plugin_test
-
-import (
-	"testing"
-
-	"github.com/mattermost/mattermost-server/v5/testlib"
-)
-
-var mainHelper *testlib.MainHelper
-
-func TestMain(m *testing.M) {
-	var options = testlib.HelperOptions{
-		EnableResources: true,
-	}
-	mainHelper = testlib.NewMainHelperWithOptions(&options)
-	defer mainHelper.Close()
-
-	mainHelper.Main(m)
-}