Remove version detection for post scheduling

[connyduck]

We currently check the version of the active Mastodon instance to decide whether to enable post scheduling or not.
This was relevant 2 years agon when post scheduling was new, but now virtually no instance runs a version below 2.7.0 anymore.
The code and the corresponding tests can be removed.

[Arteneko]

Trying my hand at it right now

[guntbert]

@connyduck Do you want to keep the no longer needed member supportsScheduled in InstanceInfo (and just set its value to true when calling the constructor)?
If we remove it that might have consequences for code calling InstanceInfo()

[guntbert]

@Arteneko are you working on this? I don´t want to step on your toes 😉

[connyduck]

@connyduck Do you want to keep the no longer needed member supportsScheduled in InstanceInfo (and just set its value to true when calling the constructor)?
If we remove it that might have consequences for code calling InstanceInfo()

I'd remove it (and adjust the callsites accordingly ofc)

[Arteneko]

I am not, tried to work on it but I can't seem to even compile the app or run the tests due to random JVM errors