ci: format integration test directory

Makefile

@@ -296,7 +296,7 @@ $(foreach tt,$(ALL_ELIXIR_TGZS),$(eval $(call gen-elixir-tgz-target,$(tt))))
 
 .PHONY: fmt
 fmt: $(REBAR)
-	@$(SCRIPTS)/erlfmt -w '{apps,lib-ee}/*/{src,include,priv,test}/**/*.{erl,hrl,app.src,eterm}'
+	@$(SCRIPTS)/erlfmt -w '{apps,lib-ee}/*/{src,include,priv,test,integration_test}/**/*.{erl,hrl,app.src,eterm}'
 	@$(SCRIPTS)/erlfmt -w 'rebar.config.erl'
 	@mix format