[PATCH] DownloadOsmChange task should not always get the history for each unknown object

[taylor.smock]

When downloading an OSC, especially if the OSC primarily deals with ways, a user may wait an extended period of time for the Node objects to be downloaded. This is often not necessary, since many nodes don't change frequently, if at all.

With the attached patch, the timings for https://maproulette.org/api/v2/task/147247105/cooperative/change/task_147247105_change.osc for went from 105s to 14s, assuming no user interaction.

[taylor.smock]

Ticket retargeted after milestone closed

[taylor.smock]

In 18711/josm:

Fix #22726: DownloadOsmChange task should not always get the history for each unknown object

In many cases, the latest version of an object will also be the version we will
get when iterating through all of its history. This will always be the case for
objects with only one version. As such, in most cases, getting the latest version
of an object will significantly reduce the number of individual history calls.

In a test, the amount of time taken to load an OSC went from 105 seconds to 14
seconds. This is an 86% improvement in terms of time taken.