Use old async timer chan for e2e tests

We are getting some flakyness with tests crashing on time.Sleep.
I am guessing it's a go1.23 change that is causing this, see:

https://go.dev/wiki/Go123Timer

try to use the old async timer chan to see if it fixes the issue.

Makefile

@@ -73,7 +73,8 @@ test-e2e-cleanup: ## cleanup test e2e namespace/pr left open
 
 .PHONY: test-e2e
 test-e2e:  test-e2e-cleanup ## run e2e tests
-	@go test $(GO_TEST_FLAGS) -timeout $(TIMEOUT_E2E)  -failfast -count=1 -tags=e2e $(GO_TEST_FLAGS) ./test
+	@env GODEBUG=asynctimerchan=1 \
+		go test $(GO_TEST_FLAGS) -timeout $(TIMEOUT_E2E)  -failfast -count=1 -tags=e2e $(GO_TEST_FLAGS) ./test
 
 .PHONY: html-coverage
 html-coverage: ## generate html coverage