* 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.
Move to use the provisionator and add a make file to generat the script
so that we only have to bump xcode in a single place.
Move all deps to provisionator and make provisionator download and
install the xi pkg that has been built to be tested in the pipeline, we
do not longer use curl to do it.