[main] Update dependencies from mono/linker (#56593)

[main] Update dependencies from mono/linker (#56593)

* Update linker warning suppressions

https://github.com/mono/linker/pull/2145 warns when accessing members
annotated with DynamicallyAccessedMembers using reflection, and
https://github.com/mono/linker/pull/2162 updates the warning origin of
warnings for DynamicallyAccessedMembers on types.

This adds suppressions for the new warnings.

* Add windows-specific suppressions

* Update dependencies from https://github.com/mono/linker build 20210729.2

Microsoft.NET.ILLink.Tasks
 From Version 6.0.100-preview.6.21378.1 -> To Version 6.0.100-preview.6.21379.2

* Fix failures and address feedback

- Annotate mono's EnumBuilder and TypeBuilder
- Add (non-unique) readable short names to the warning codes

* Update dependencies from https://github.com/mono/linker build 20210730.2

Microsoft.NET.ILLink.Tasks
 From Version 6.0.100-preview.6.21378.1 -> To Version 6.0.100-preview.6.21380.2

* Suppress IL2111

* Update dependencies from https://github.com/mono/linker build 20210802.2

Microsoft.NET.ILLink.Tasks
 From Version 6.0.100-preview.6.21378.1 -> To Version 6.0.100-preview.6.21402.2

* Feedback

- Suppress IL2111 in trimming tests
- Remove unnecessary DynamicDependency
- Fix indentation

* Update readable warning names

Co-authored-by: Sven Boemer <sbomer@gmail.com>
Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>