* eslint: Check for unused function arguments
* eslint: Ignore unused '_' in argument list
Also allow any number of '_' e.g., '__' or '___' which is to be used sparingly
* Remove and rename unused arguments
* Send metrics event from backend for on chain transaction failures
* Passes state object to backEndMetaMetricsEvent, and adds getMetaMetricState selector
* getMethodData() default to abi decoded method if registry lookup errors
* Update e2e tests to work with getMethodData() fallback changes
* Remove indeterminency in gas input key entering in send token e2e test.
Whymarrh Whitby
Dan J Miller
Chi Kei Chan