Remove the >1 hour delay between master and the conservative registry flavor.

[LilithHafner]

In #120562, @DilumAluthge indicated that it's expected/acceptable for the conservative registry flavor to lag up to 24 hours. I think it would provide a better package developer and user experience if we limited that lag to a lower time (ideally minutes or seconds) and document expected lag time.

One possible way to do this would be to eliminate conservative altogether and make the package servers capable of serving packages they haven't fully downloaded yet by streaming from their source (e.g. GitHub) with caching and prioritizing such streaming over traffic to those source servers that is for updating packages that don't have users actively waiting for them.

[fredrikekre]

Normally the lag is minutes in my experience. Once the current issues are resolved I will setup something that measures this though.