4446 ignore then fail strategy v3

[pditommaso]

This PR implements the fail on ignore by using by setting the option nextflow.enable.failOnIgnore in the nextflow config file.

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[bentsherman]

I would suggest exposing it as nextflow.failOnIgnore so as to not confuse it with feature flags. Long term I don't think we should allow feature flags in the config because they are inherent to the pipeline code.

[bentsherman]

In other words:

• nextflow config scope is used for runtime options and is only relevant in the config file
• feature flags are used for language options and are only relevant in the script

[pditommaso]

That was the first option, but then I realised it's not a feature flag but more a workflow (error handling) behaviour, and as such reported in the workflow metadata

[pditommaso]

Let's go