Fixes/improves expired preview log handling

[clpetersonucf]

One overlooked change to the API error state improvements is the way expired preview logs are handled; they no longer tripped the Preview Expired view rendering because the API was returning a 204 instead of an error code. This small PR adds a new expired() static method to the Materia Msg class, which returns a 410 response (Gone) instead of a 204. Note that the associated react query has retry: false applied to reduce the delay between error receipt and the Expired Preview view being rendered.

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[cayb0rg]

Great catch! I see no issues with this. If I had to nit-pick, the only suggestion I'd have (and I don't know if this is actually better) is to use PHP's empty() function instead of is_array() so it'd catch any type of empty return value from get_preview_logs, but not necessary.