[MM-33662] - Mock out CWS in enterprise code (#17305)

* [MM-33662] - Mock out CWS in enterprise code

* Feedback impl

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

Makefile

@@ -143,6 +143,8 @@ all: run ## Alias for 'run'.
 include config.mk
 include build/*.mk
 
+LDFLAGS += -X "github.com/mattermost/mattermost-server/v5/model.MockCWS=$(MM_ENABLE_CWS_MOCK)"
+
 RUN_IN_BACKGROUND ?=
 ifeq ($(RUN_SERVER_IN_BACKGROUND),true)
 	RUN_IN_BACKGROUND := &