Temporary accounts: Create user on edit save attempts

Why:

- Certain hooks and constraints that deny edits (SpamBlacklist,
  AbuseFilter) generate manual log entries; these logs need to
  reference an actor. The actor should be the same across multiple
  failed attempts to save an edit.
- In order to hide the IP address associated with the request,
  we can create a temporary account for every edit attempt, to
  ensure that we associate the request with the log entry.

What:

- Create the temporary account at the beginning of
  `EditPage::internalAttemptSave`. This is a change from the previous
  temporary account creation paradigm, which created an account for a
  successful edit attempt.
- Remove the pageUpdater->isChange check, as we don't have a pageUpdater
  object at time of temp account creation.
- Temporary accounts are also created for no-op changes (pressing
  "Publish" with unchanged wikitext editor contents)
- Note that temporary accounts are *not* created when permission related
  errors are present in the edit attempt (e.g. a user attempts to edit
  from a blocked IP address)

Bug: T359405
Change-Id: Ib6765f828681e70d798363338910a54c7de4ed67

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