Adding changes to separate unit tests and integration tests (#13670)

* Introducing unit (not integration) tests for the app layer

* Initial support for unit tests at the API

* Adding unit tests support to the store layer

* Add unit tests support in commands

* Adding last tests needed for run unit tests properly

* Fixing govet

* Removing some duplication

* Fixing tests

* Fixing tests

* Not compiling test helpers with the main module for api

* Revert "Not compiling test helpers with the main module for api"

This reverts commit 36a199bbe0f7503f665f5d6c7b41c53aabc2e54f.

* Fixing tests

* Fixing unit tests

* More consistency between api4/apiteslib.go and app/helper_test.go

* Renaming things to make more obvious the new Setup functions purpose

* Reverting change in go.sum

* Start with empty mock for app layer

* Start with empty mock for api layer

* Start with empty mock for web layer

* Renaming SetupWithStoreMockConfig to SetupConfigWithStoreMock

* Fixing tests on web package

* Removing unnecesary function

model/migration.go

@@ -5,4 +5,15 @@ package model
 
 const (
 	MIGRATION_KEY_ADVANCED_PERMISSIONS_PHASE_2 = "migration_advanced_permissions_phase_2"
+
+	MIGRATION_KEY_EMOJI_PERMISSIONS_SPLIT                     = "emoji_permissions_split"
+	MIGRATION_KEY_WEBHOOK_PERMISSIONS_SPLIT                   = "webhook_permissions_split"
+	MIGRATION_KEY_LIST_JOIN_PUBLIC_PRIVATE_TEAMS              = "list_join_public_private_teams"
+	MIGRATION_KEY_REMOVE_PERMANENT_DELETE_USER                = "remove_permanent_delete_user"
+	MIGRATION_KEY_ADD_BOT_PERMISSIONS                         = "add_bot_permissions"
+	MIGRATION_KEY_APPLY_CHANNEL_MANAGE_DELETE_TO_CHANNEL_USER = "apply_channel_manage_delete_to_channel_user"
+	MIGRATION_KEY_REMOVE_CHANNEL_MANAGE_DELETE_FROM_TEAM_USER = "remove_channel_manage_delete_from_team_user"
+	MIGRATION_KEY_VIEW_MEMBERS_NEW_PERMISSION                 = "view_members_new_permission"
+	MIGRATION_KEY_ADD_MANAGE_GUESTS_PERMISSIONS               = "add_manage_guests_permissions"
+	MIGRATION_KEY_ADD_USE_CHANNEL_MENTIONS_PERMISSION         = "add_use_channel_mentions_permission"
 )