auto-exporter: disable for certain streamers

[timschneeb]

Is your feature request related to a problem? Please describe. The automatic file exporter currently uploads VODs of all channels.

Describe the solution you'd like A per-channel setting could be added to disable the auto-exporter for a whole channel. (similar to the existing 'Don't record streams' checkbox, but for video exports only)

Describe alternatives you've considered

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Additional context

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