Fix GH-12727: NumberFormatter constructor throws an exception on invalid locale.

Also re-establishing exception throwing on IntlDateFormatter constructor
overwritten by accident most lik

Fix GH-12727: NumberFormatter constructor throws an exception on invalid locale.

Also re-establishing exception throwing on IntlDateFormatter constructor
overwritten by accident most likely so postponing it for next major
release.

Close GH-12868

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ext/intl: change when the locale is invalid for the 8.1/8.2 serie.

does not throws an exception as it's considered as a too string change,
but the code user still needs to double check.

Close PHP tags in tests

Closes GH-12422

Fix GH-12282: IntlDateFormatter::construct should throw an exception is the locale field has an invalid value.

Close GH-12282