Ignore lines made long by cop directive comments

[sambostock]

This resets Layout/LineLength's IgnoreCopDirectives to its default - true .

Assuming a config of Max: 20, for example purposes, this would be an offense based on our current config:

const_get(something) # rubocop:disable Sorbet/ConstantsFromStrings                                                                                                                    
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

and the author would have to resort to the more verbose

# rubocop:disable Sorbet/ConstantsFromStrings 
const_get(something)                                                                                                                    
# rubocop:enable Sorbet/ConstantsFromStrings

We already allow test descriptions to be long. I argue a similar justification applies here and that the inline version is better.

There is another alternative

const_get(something) # rubocop:disable Sorbet/ConstantsFromStrings,Layout/LineLength

but that makes the line even longer than before, so I think it makes sense to just allow directives.