Applies the settings the payload carries and leaves the rest as they are, so changing one setting takes
a payload with one field in it. A field left out, or sent as null, is not changed; clearing one is asked
for with its empty form, an empty string for text or an empty list for maintenance windows.
Dispatches a job that applies the change in Azure and then refreshes Foundry's copy of this host pool,
so once the job completes the change is readable back without waiting for the next inventory sync.
A cleared text setting reads back empty rather than absent, because Azure cannot remove a property it
holds, and the maintenance window time zone cannot be cleared at all.
Settings that do not apply to this pool's type may be omitted or echoed back unchanged but cannot be
given a different value, and host pool type and region cannot be changed after the pool is created.