Use a QgsScrollArea when adding or inserting pages to QgsOptionsDialogBase

[uclaros]

Description

Most pages in QgsOptions encapsulate their contents within a hard coded QgsScrollArea to allow for scrollbars when shrinking.
However, many pages in options and other subclasses use the QgsOptionsDialogBase::insertPage or QgsOptionsDialogBase::addPage and force a minimum height to the parent dialog which is often quite big. This can also happen by plugins that add a page to the project properties or options dialog.
With this PR, all pages added with those methods are wrapped around a QgsScrollArea and now all QgsOptionsDialogBase derived dialogs can be resized to fit in smaller screens.

Properly fixes the already closed #32021

[github-actions]

🪟 Windows builds ready!

Windows builds of this PR are available for testing here. Debug symbols for this build are available here.

(Built from commit 4223130)

[agiudiceandrea]

Hi @uclaros, please see #56381. I think that issue may be related to this PR.

[uclaros]

Good catch!
#56384 should fix this

[agiudiceandrea]

Thank you for your super fast fix!