Qt 6.3 examples marked for highlight removal

This user story collects all the examples that should not be highlighted anymore in the Qt 6.3.0 release.

We have more examples now with Qt 6.3 so no need to highlight all that were previously highlighted. This is just for removing the highlight of the example so it's still visible and searchable in the list.

In general, highlighted example should have both, good visual and code quality. Also they should be considered as something new users want to see the first when opening Qt Creator. These to-be-removed highlighted examples didn't fit to these requirements.

Also, some of the remaining highlighted examples should be revisited later and make sure that they qualify.