tests that execute envoytest.RunKill are flakey

[codefromthecrypt]

Tests that include lines like below can fail because they execute in the same directory

		err = envoytest.RunKill(r, filepath.Join("testdata", "null.yaml"), time.Second*10)
		require.NoError(t, err, "error from envoytest.RunKill")

    --- FAIL: Test_retrieveAdminAPIData/creates_all_non-empty_files (0.33s)
        admin_test.go:47: 
            	Error Trace:	admin_test.go:47
            	Error:      	Received unexpected error:
            	            	error killing runner: reading file in tar archive: file already exists: /home/circleci/.getenvoy/debug/1617156514287771521/certs.json
            	Test:       	Test_retrieveAdminAPIData/creates_all_non-empty_files
            	Messages:   	error from envoytest.RunKill

[codefromthecrypt]

This is no longer broke as they don't execute in the same dir anymore