Replace custom targets for generating assembly attributes and source control info by using SDK features

[natemcmaster]

Part of aspnet/BuildTools#618 and preparation for #7280

Changes:

• This disables the sourcelink and attribute generation targets from Internal.AspNetCore.Sdk
• Replace source linke with Microsoft.SourceLink.{GitHub, Vsts.Git} packages
• Replace Internal.AspNetCore.Sdk task which generates file version by using the values already computed in version.props
• Move some properties from Directory.Build.props to CSharp.Common.props if they only apply to C# projects
• Port some settings from Internal.AspNetCore.Sdk into Directory.Build.props. Except for some build tasks still used, we're almost ready to completely remove this package.
• add workaround for Microsoft.SourceLink does not work with Razor components #7503

[SteveSandersonMS]

Components changes look good.

[dougbu]

Questions, questions…

[dougbu]

Does this mean we can only build -t000 packages locally now? Ugh

[natemcmaster]

You can still override whatever you want, e.g. build.cmd /p:IsOfficialBuild=true, build.cmd /p:BuildNumberSuffix=1234, etc. This change is mean to remove the part of this code that uses TeamCity environment variables.

[dougbu]

Seems odd to me that *.proj, *.javaproj, *.npmproj, *.pkgproj, *.shfxproj , and *.vcxproj aren't included in this condition. Why not?

[natemcmaster]

The project types listed were excluded because adding the PackageReference causes NuGet to fail because they don't import Microsoft.Common.targets. We probably could disable source link on javaproj/npmproj, but I left them on enabled because they weren't causing issues.