TestActivityRetryOnError is flaky

[vitarb]

TestIntegrationSuite
    integration_test.go:331: 
        	Error Trace:	integration_test.go:331
        	Error:      	Not equal: 
        	            	expected: []string{"fail", "fail", "fail"}
        	            	actual  : []string{"fail", "fail"}
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1,3 +1,2 @@
        	            	-([]string) (len=3) {
        	            	- (string) (len=4) "fail",
        	            	+([]string) (len=2) {
        	            	  (string) (len=4) "fail",
        	Test:       	TestIntegrationSuite
2021/09/23 23:26:39 INFO  Stopped Worker Namespace integration-test-namespace TaskQueue tq-1-TestIntegrationSuite/TestActivityRetryOnError WorkerID 69614@arch@
--- FAIL: TestIntegrationSuite (13.53s)