* Improve build reliability
- ensure `ResolveCustomReferences` target executes before packages are used
- `ResolveAssemblyReferences` and `ResolveAssemblyReferencesDesignTime` targets run too late
- e.g. failed builds of Microsoft.AspNetCore.WebUtilities or Microsoft.AspNetCore.Hosting when building from root
- add `GetReferenceProjectTargetPathMetadata` for ease of use as well as reliability
- avoids extra work to get existing metadata (ref/ projects execute no tasks in this target)
nit: rename `@(ReferenceProjectMetadata)` -> `@(ReferenceProjectTargetPathMetadata)`
* Ensure `GetTargetPathMetadata` target runs with `$(TargetFramework)` set
- ref/ projects all multi-target and otherwise no-op this target
* Revert "Fix various "Type or namespace not found" errors (#20736)"
- change is no longer needed with other fixes in this PR
This reverts commit 8218d6e0e7.
de38479e5f