Add validation check and configuration for user full names

Frank Duncanrequested to merge
ardc-240-add-fullname-check into ardc-main

Fixes ots/clients/ardc/hypha-tracker#240

Will require a change in production in local.py or gunicorn_start:

INVALID_FULL_NAME_REGEXES = [
    ".*http://.*",
    ".*https://.*",
]

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