* 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
* Get contract method data from 4byte if we can't get it from eth-method-registry
* Clarify token method name fallback code in getMethodData
* Bugfix: don't attempt to translate falsy actionKeys in confirm-transaction-base.component.js
* Rewrite getMethodFrom4Byte with async-await
* Call four byte and method-registry requests in parallel in getMethodData()
* 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.