Scan imported to the wrong exam should not move to "done" state

When a teacher import a pdf with scanned copied to an Papeez exam, if a copy is not related to the exam, it should not be processed.

Theses pages should be identifiable by the teacher to be reimported to the correct exam.

This happen in two cases:

• when a teacher import a pdf on the wrong exam
• when a teacher import a pdf with pages from several exams (ex: if there is 2 version of the same exam in FR/EN)

Expected behavior

-> To refine

Only the ScannedPaperQuizSheet not related to the PaperQuizSheet of the exam should not be processed.

Not processed =

• scores + answers should not be created
• ScannedPaperQuizSheetshould not be matched to it's PaperQuizSheet
• ScannedPaperQuizSheetshould not move in analysis_completed

A new dedicated state may be created to identify page imported to the wrong exam.