Michael Hawkins e3b3ba90c8 MDL-74643 core_user: New admin setting for site support availability
This allows admins to configure whether contact site support is
available to everyone, authenticated users, or nobody.

The behat testing checks linked and direct access for each setting,
as well as adding testing that the support page override works as
expected.
2022-10-31 18:58:06 +08:00
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