a11y: Do not cache classes that don't have a factory plugin

For Qt Widgets we thought it was a good idea to also store in the cache
if a class didn't have a factory plugin. This worked fine there, since
the number of QWidget classnames is quite limited (so the factory plugin
cache will soon reach a limit)

In QML however, classes are often suffixed with e.g. Button_QMLTYPE_123,
Button_QMLTYPE_124 etc.
This number suffix is just increased continuously. This could lead to that
the factory plugin cache will grow ad infinitum, which will cause
"memory leaks" in addition to a performance penalty.

Fixes: QTBUG-75106
Change-Id: I9ba189f989f0b90ab62a2c54a2e9230236a998d8
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 583668005d4d6399fc16d165dcb6a5af2b94323d)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

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