[Tests] Fix Prometheus metrics parsing for "+Inf" in PrometheusMetricsTest and Pulsar Function tests #10193
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Motivation
PrometheusMetricsTest has been flaky with this type of error mesage:
java.lang.AssertionError: line pulsar_broker_publish_latency{cluster="test",quantile="0.0"} +Inf does not match pattern ^(\w+)\{([^\}]+)\}\s(-?[\d\w\.-]+)(\s(\d+))?$ expected [true] but found [false]The problem is that the metrics parsing hasn't properly handled
+Infwhich is used as a value when there are no metrics.Modifications
Fix the regex pattern to handle
+Infand add tests.