testing/dotnet6: merge bootstrap into stage0

Merged Antoine Martin requested to merge ayakael/aports:testing/dotnet6-stage0-new into master

Applies following changes:

  • merges bootstrap into stage0 to respect stage0 implementation as proposed here
  • added testing suite to stage0
  • updated patches on stage0
  • build can build upon itself, and packages artifacts
  • runtime / sdk adapted to pull from correct directory
Edited by Antoine Martin

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