Remove PrometheusStatisticsTest Test Case because
it's changed in the with the new observability implementation.
<exclude name=".*"/>
</methods>
</class>
+ <class name="org.wso2.carbon.esb.statistics.PrometheusStatisticsTest">
+ <methods>
+ <exclude name=".*"/>
+ </methods>
+ </class>
</classes>
</test>
