Make our local .NET the default .NET (in the root's global.json), and then if
a directory wants to use the system .NET, then that directory would have to
opt-in (using its own global.json).
This way we don't have to copy global.json/NuGet.config files around to run
tests with the correct .NET setup.
Also rename DOTNET_VERSION to SYSTEM_DOTNET_VERSION to make it clear what it's
referring to (and to not clash with DOTNET6_VERSION which has now been renamed
to DOTNET_VERSION).
.NET 7 is right around the corner.
* Bump to .NET 6.0.100-alpha.1.21060.3.
* Fix dotnet command line arguments.
* dotnet build: the project file must be the first argument.
* dotnet build/publish: use the documented verbosity format.
* Update version number in tests.
* [tests/introspection] Adjust introspection to cope with different library names in the new .NET version.
* [tests/link sdk] Adjust the LinkSdkRegressionTest.SpecialFolder test according to the new version of .NET 6.
* [tests/link sdk] Preserve a required method in System.Private.CoreLib to work around a bug in .NET 6.
Ref: https://github.com/dotnet/runtime/issues/46908.
* Revert "[CI][VSTS] Add the donet 6 pkg as a dependency. (#10348)"
This reverts commit 6de4e717e7.
There's no need to provision .NET 6, it's done automatically.
Alex Soto
Rolf Bjarne Kvinge
Sandy Armstrong
Manuel de la Pena