[mono] Remove AzureRepos.Git package
[mono] Remove AzureRepos.Git package

```
/Users/radical/dev/msbuild/.packages/microsoft.sourcelink.azurerepos.git/1.1.0-beta-20206-02/build/Microsoft.SourceLink.AzureRepos.Git.targets(28,5): error : The value of SourceRoot.RepositoryUrl with identity '/Users/radical/dev/msbuild/' is invalid: 'ssh://git@github.com/Microsoft/msbuild.git' [/Users/radical/dev/msbuild/src/Framework/Microsoft.Build.Framework.csproj]
```

We are building from just github right now.

mono/msbuild,mono/msbuild,mono/msbuild,mono/msbuild