Move config sync.{user,password} to opencast.*

[LukasKalbertodt]

The sync user+password is by now also used for other purposes, like talking to the external API to delete events. So having them in the sync section is not really useful. This will be a breaking change, so I would like to include it in a release that has a breaking change anyway.

Or... add multiple credentials? Like, use different ones for external API and sync for example?

[owi92]

Or... add multiple credentials? Like, use different ones for external API and sync for example?

I would prefer to use the same credentials for both sync and other external API stuff, mainly to keep things simple. Is there a practical reason for splitting these?

[LukasKalbertodt]

To be honest: I don't know. We got surprised before by needing to use a special hosts for external API for example. Maybe there are reasons why people want to use different credentials? I suppose it makes not sense for security, because both users need ROLE_ADMIN anyway. Might be worth asking in the technical meeting once? Or not ignoring my remark for which I had no concrete basis anyway 🤷

[owi92]

I did not ask in the technical meeting, but yeah, should be fine I think.

[LukasKalbertodt]

done in #1296