Pass PublishType to individual build publish legs

Pass PublishType to individual build publish legs

For individual legs we only want to push things to azure container
for the given build when we are in orchestrated build mode (i.e.
PB_BuildType != nopublishtype).

Commit migrated from https://github.com/dotnet/core-setup/commit/1062c890a61c37f36b2a07fa276e1f7aec763259