Add filter to git hook (dev qol)

[anthonydresser]

Currently the git hook takes every change you have and starts the filter from there and bypasses the "all" filter.

This changes it so the files from the git hook are filtered through "all" first.

I considered adding the filter at https://github.com/microsoft/vscode/blob/master/build/gulpfile.hygiene.js#L332 instead, but this seems like a more targeted fix.

[joaomoreno]

Actually, since one can also invoke gulpfile.hygiene.js as a standalone script, it would be better to have the fix up there instead, such that files passed in such a way also run through the all filter. What do you think?

[anthonydresser]

I was also thinking that, but I wasn't sure if there was a scenario where we would want to just hygiene exactly what the caller passed (i.e it was intentional to pass in a file not listed by the all filter). But I generally agree that it would make more sense just to filter everything that goes through hygiene.

[anthonydresser]

@joaomoreno I've updated it to filter everything passed into the hygiene task, let me know what you think.

[joaomoreno]

Excellent, thanks! 🎆