Make CSV deprecation less annoying to deal with (#15569)

ext/standard: Throw ValueErrors in str_getcsv() for invalid inputs (#15365)

This was forgotten when adjusting the behaviour of other CSV functions

ext/(standard|spl): Deprecate passing a non-empty string as the $enclosure parameter (#15362)

Fix GH-12151: str_getcsv ending with escape zero segfualt

Closes GH-12152