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Add a hook run after EditPage::attemptSave for WikiEditor

Description

Add a hook run after EditPage::attemptSave for WikiEditor

So that we can determine whether a save attempt succeeded or failed,
to log saveSuccess and saveFailure events from the server to Schema:Edit
on meta.

Bug: T88027
Change-Id: Ib861262603872e67600d1aab9bde3b58a8dd1738