This notably fixes the v1 "confusing" behaviour when matching folders,
where the expectation is for any of:
folder
folder/
/folder
to match the folder and all paths below it, but v1 would only do this
when *both* of these were added:
**/folder
**/folder/**
Which is very verbose and has caught literally everyone who's ever tried
to do this kinda thing.
The old behaviour is preserved in the globset filterer, for
compatibility, as there are other small behavioural changes that this
affects, even though the new behaviour in the tagged filterer is
arguably the most correct and the old is a bug.
* the InitConfigBuilder non-miette error goes away
* creating an InitConfig is no longer faillible for no reason
* the "builder" style is consistent between the two config structs
It's not exactly a builder, and this lets us flatten all the options at the
top level instead of requiring the user to dig deeper into the
action, fs, etc modules' WorkingData structs.
