Revert use to standardized LTI field instead of Moodle specific field for the username
Steps to reproduce
Introduced by MH-12840:
The Moodle-only field `ext_user_username` is used to extract the the username form the LTI authentication request instead of the optional standardized field `lis_person_sourcedid`.
Fixed and reviewed
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Incorrectly Functioning Without Workaround
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