Andrew Nicols 8b97071c94

MDL-78738 core_communication: Set avatar from a stored_file ...

We should always use a stored_file instance to set the avatar, and never
a data uri. Especially where the datauri is from Moodle itself.

This change requires a number of changes in associated locations.

I am not adding this change to any upgrade notes as this is a
master-only feature.

Note: I have removed some tests and will not consider fixing them
because I will be entirely removing that test file in a subsequent issue
(MDL-77917).

2023-08-01 19:50:14 +08:00

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