Address https://github.com/dotnet/runtime/issues/45428 #388
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There seems to be a mystery state where the install cache is full or something, rebooting device helps.
Also improve wait-for-device to actually check the boot_completed property (exposed by rebooting devices) and fix standard error logging bug pointed out by @akoeplinger that's been there forever.
Since the state is mysterious, I prototyped an "always reboot the device" version of Xharness and ran it several times Sample log to be sure the concept here works (logging has been cleaned up a bit)