dotnetCorePackages.sdk_10_0: 10.0.203 -> 10.0.300
dotnetCorePackages.sdk_9_0: 9.0.313 -> 9.0.314
dotnetCorePackages.sdk_8_0: 8.0.420 -> 8.0.421
These are combined into one commit because they require some common
fixes.
The update bot is currently failing to update dotnet due to fetch-deps
30m.
- add a --vmr-bootstrap flag to binary/update.sh
This allows us to skip a bunch of packages and platforms that aren't
needed for bootstrapping the VMR. We also add the IL[D]Asm packages
that were previously in deps.json for versions 9+.
- disable fetch-deps in versions 9+.
