* Clean up and changes to backoffice for the nuget only packages
* temp commit of package logic removal
* Lots of package code cleanup and removal
* Removes old package data from the test package xml
* Updates packaging code to take in XDocument instead of a file since we'll not be dealing with files, starts creating expressions for the package migrations scripting.
* fixing tests
* Fixes runtime state and boot failed middleware so that it actually runs. Separates out unattended install/upgrade into notification handlers.
* Gets unattended package migrations working and running
* Gets embedded package.xml resources able to install from package migration.
* Implements automatic package migrations for package that just declare an xml data manifest.
* fix build
* small cleanups
* fix build
* adds some tests
* Fix export test
* Fix newlines in test for linux
* Typo
* removes old todos and updates AutomaticPackgeMigrationPlan to use getter with backing field.
Co-authored-by: Bjarke Berg <mail@bergmania.dk>
