Flaky Unit Test TestNewInterStepDataForward/batch_forward_basic

[yhl25]

=== RUN   TestNewInterStepDataForward/batch_forward_basic
{"level":"info","ts":"2024-04-17T05:53:10.177109808Z","logger":"numaflow","caller":"forward/forward.go:136","msg":"Starting forwarder..."}
    forward_test.go:1709: unexpected collecting result:
        
        
        Diff:
        --- metric output does not match expectation; want
        +++ got:
        @@ -1,5 +1,2 @@
        -(bytes.Buffer) # HELP forwarder_ack_total Total number of Messages Acknowledged
        -# TYPE forwarder_ack_total counter
        -forwarder_ack_total{partition_name="from",pipeline="testPipeline",replica="0",vertex="testVertex",vertex_type="MapUDF"} 10
        +(bytes.Buffer) 
         
        -

https://github.com/numaproj/numaflow/actions/runs/8716970620/job/23912020354?pr=1669