Fix some ways to create inconsistent Viewport size states #73188
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In the editor, it was possible to set the size of a
SubViewport
even in cases where a parentSubViewportContainer
had stretch enabled (which automatically adjusts the size).This PR disables editing a
SubViewport.size
while the parent disallows it and it makes necessary adjustments duringNOTIFICATION_ENTER_TREE
.fix #73160 by disallowing to create the situation where the described problem can happen
continuation of #66906
supersedes #72556