* separate backoffice install into its own template
* add new job to build the backoffice npm package
* move location of templates
* set version, then build, then pack
* use nbgv to get just the NpmPackageVersion
* calculate version earlier and for both builds
* merge two tasks
* add Build keyword to the display name
* get the node version from the backoffice
* update backoffice submodule
* bump npm version before restoring cache to ensure the cache key doesn't change
* add template to umbraco.sln
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