`ScheduleBuildSettings` should just use public fields

[alice-i-cecile]

What problem does this solve or what need does it fill?

ScheduleBuildSettings, added in #6587 uses a builder pattern.

This would be clearer, simpler, and more consistent if it simply used public fields.

What solution would you like?

Make the fields public and remove the builder methods.

Additional context

Please don't do this until #7267 is merged for the sake of my sanity.