Add post validations also to suggested edits (301, 764, 765) #1136
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Separates out shared post validations to a concern and adds this concern on both Post and SuggestedEdit. This means that the validations will be in line between them. Some validations remain in Post as they are specific to posts (moderator_tags should not be checked on suggested edits, see #741).
I also fixed some (as far as I know) unreported issues with the validations not working as intended:
I have altered the if statements on the validations for title and body length as those can be nil for suggested edits (means no change suggested for them). This is not a problem for posts, because other validations on Post already catch when they are empty.
Fixes #301
Fixes #764
Fixes #765