Remove usages of deprecated APIs

- Replaced the following deprecated APIs:

  QWebEngineProfile::setRequestInterceptor -> QWebEngineProfile::setUrlRequestInterceptor
  QWebEngineSettings::globalSettings -> WebEngineSettings::defaultSettings
  QLayout::setMargin -> QLayout::setContentsMargins
  QWheelEvent::{x, y} -> QWheelEvent::position
  QWheelEvent::{globalX, globalY} -> QWheelEvent::globalPosition
  QSysInfo::windowsVersion -> QOperatingSystemVersion::current
  Qt::InputMethodQuery::ImMicroFocus -> Qt::InputMethodQuery::ImCursorRectangle
  QDesktopWidget::screenGeometry -> QGuiApplication::primaryScreen::geometry
  QTime -> QElapsedTimer

- Fixed the tests to compile when deprecated APIs are disabled.

- Replaced the doc references to deprecated APIs with the new ones.
  Made the docs for deprecated APIs compile conditionally, based on
  deprecation version.

Task-number: QTBUG-76491
Change-Id: I5c6b7c628957deb9163f0bd2b6bc31bde1c7daec
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>