Back out of calendar support in Qt::DateFormat methods

We're deprecating the locale-specific date-formats, which are the only
ones that use the calendar. The QDateTime::toString() variant was new
in 5.15, so we can simply remove it again.  The QDate one was present
in 5.14, so we need to keep it; deprecated it at 5.15 for removal at
Qt 6.

[ChangeLog][QtCore][QDate] QDate::toString(Qt::DateFormat, QCalendar)
no longer takes calendar into account for Qt::TextDate. There was no
matching support in QDateTime and the locale-independent formats are
intended to be standard, rather than customized to the user.

Fixes: QTBUG-82178
Change-Id: I09db8a82ec5a4eab22f197790264fa3a3724e383
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

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