Updates on CI (#17484)

* moving mattermost-ver and golangci out from the build step

* adjusting resource class and update image for check-mocks job

Makefile

@@ -325,7 +325,8 @@ ifeq ($(BUILD_ENTERPRISE_READY),true)
 	./scripts/prereq-check-enterprise.sh
 endif
 
-check-style: golangci-lint plugin-checker vet ## Runs golangci against all packages
+check-style: golangci-lint plugin-checker vet ## Runs style/lint checks
+
 
 do-cover-file: ## Creates the test coverage report file.
 	@echo "mode: count" > cover.out