This allows this component to follow existing design patterns, rather
than being its own unusual element with various quirks.
The implementation is approximately the same as before I just migrated
"Edit custom profile field" form into modal, like "Add new custom
profile field" form modal.
Fixes: #21634
This lets us remove this fairly ugly user interface widget, which was
inconsistent with the rest of the settings UI.
The implementation is approximately the same as before I just migrated
"Add new custom profile field" form into a modal, status update
notifications about these forms will be displayed inside their modal,
and made some little design changes as discussed on CZO.
Fixes part of: #21634
The only downside of this is that it makes it harder to control the
order of these tests; which isn't that important. And the structure
of naming each with its test order fundamentally requires renaming
files when adding/deleting tests, so if we want to control the default
test order, we'd be better off doing that by just hardcoding a list in
the test runner code.