DatePicker: Date formatting symbols appear in aria-label

[noisysocks]

I noticed that the aria-label on the day component outputs symbols.

Not sure if the problem is in moment(). It's something to do with the locale aware format LL

This works

const ARIAL_LABEL_TIME_FORMAT = 'dddd, MMMM DD, YYYY'; // Monday, May 09, 2022

But it's not locale aware I presume so it might need some further 👀

Originally posted by @ramonjd in #41097 (comment)

[noisysocks]

We probably should use our own dateFormat function that's in @wordpress/date here:

gutenberg/packages/components/src/date-time/date.tsx

Line 44 in ef6c2fe

const dayAriaLabel = moment( day ).format( ARIAL_LABEL_TIME_FORMAT );