Don't fail if benchmark performs better irrespective of threshold config

[madhan-mettle]

There might be situations if the changes drastically improves the performance or the thresholds are configured with lower values it lead to failure of the action whereas it is not.

i.e if the alert and failure threshold are configured as 0.1 and 0.2 and the previous and current values are bigger, then the existing check would consider it as failure

So added a check to ensure the failure is calculated based on the performance and threshold rather than threshold alone