Stylelint 15 deprecates a heap of rules which will be removed in 16.
We can't use 16 because it's ESM and requires a big restructure of our
build process.
We can temporarily silence the deprecations and then when we update our
build tooling we can make use of @stylistic/stylelint-plugin to add the
rules back.
This commit:
- bumps stylelint and related dependencies accordingly
- fixes issues identified with newer sniffs
- temporarily silences deprecation warnings
As part of fixing this, I refactored some common code out of
get_potential_users and search_other_users. Previously, only one of
those bits of code had been updated.
At the same time this commit introduces a standardised dialogue YUI module to enrol and implements it across the board.
This commit also addresses MDL-23292 and MDL-23319.
