Hitting restore timeouts with NuGet

[jaredpar]

Hitting timeout issues with nuget.org.

  Restore completed in 5.75 sec for /Users/runner/runners/2.166.2/work/1/s/src/VS.Web.CG.Msbuild/VS.Web.CG.Msbuild.csproj.
  Retrying 'FindPackagesByIdAsync' for source 'https://api.nuget.org/v3-flatcontainer/microsoft.codeanalysis.common/index.json'.
  The HTTP request to 'GET https://api.nuget.org/v3-flatcontainer/microsoft.codeanalysis.common/index.json' has timed out after 100000ms.
  Retrying 'FindPackagesByIdAsync' for source 'https://api.nuget.org/v3-flatcontainer/microsoft.codeanalysis.common/index.json'.
  The HTTP request to 'GET https://api.nuget.org/v3-flatcontainer/microsoft.codeanalysis.common/index.json' has timed out after 100000ms.
/Users/runner/runners/2.166.2/work/1/s/.dotnet/sdk/5.0.100-preview.2.20165.1/NuGet.targets(128,5): error : Failed to retrieve information about 'Microsoft.CodeAnalysis.Common' from remote source 'https://api.nuget.org/v3-flatcontainer/microsoft.codeanalysis.common/index.json'. [/Users/runner/runners/2.166.2/work/1/s/Scaffolding.sln]
/Users/runner/runners/2.166.2/work/1/s/.dotnet/sdk/5.0.100-preview.2.20165.1/NuGet.targets(128,5): error :   The HTTP request to 'GET https://api.nuget.org/v3-flatcontainer/microsoft.codeanalysis.common/index.json' has timed out after 100000ms. [/Users/runner/runners/2.166.2/work/1/s/Scaffolding.sln]
##[error].dotnet/sdk/5.0.100-preview.2.20165.1/NuGet.targets(128,5): error : Failed to retrieve information about 'Microsoft.CodeAnalysis.Common' from remote source 'https://api.nuget.org/v3-flatcontainer/microsoft.codeanalysis.common/index.json'.
  The HTTP request to 'GET https://api.nuget.org/v3-flatcontainer/microsoft.codeanalysis.common/index.json' has timed out after 100000ms.

This has not yet hit our CI but is already impacting a number of PRs

Core-eng Issue https://github.com/dotnet/core-eng/issues/9634

Definition	Build	Kind	Job Name
runtime	722027	PR 38973	Build tvOS arm64 Release AllSubsets_Mono
dotnet-linker-tests	707175	PR 689	Build OSX x64 release Runtime_Release
runtime-coreclr outerloop	707057	Rolling	CoreCLR Pri1 Runtime Tests Run OSX x64 checked
runtime	604353	PR 35021	Libraries Build tvOS x64 Debug
aspnetcore-ci	604340	PR 20903	Test: macOS 10.13
runtime	604268	PR 35030	Mono Product Build tvOS x64 debug
runtime	604268	PR 35030	Mono Product Build iOS arm debug
runtime	604268	PR 35030	Mono Product Build OSX x64 release
runtime	604268	PR 35030	CoreCLR Product Build OSX x64 release
runtime	604268	PR 35030	CoreCLR Product Build OSX x64 checked
runtime	604268	PR 35030	Mono Product Build tvOS x64 release
runtime	604268	PR 35030	Mono LLVM Product Build OSX x64 debug
runtime	604268	PR 35030	Mono Product Build OSX x64 debug
runtime	604268	PR 35030	Mono Product Build iOS arm release
runtime	604268	PR 35030	Mono Product Build tvOS arm64 release
runtime	604268	PR 35030	Mono Product Build iOS arm64 release
runtime	604268	PR 35030	Mono Product Build iOS arm64 debug
runtime	604268	PR 35030	Libraries Build OSX x64 Debug
runtime	604268	PR 35030	Mono LLVM Product Build OSX x64 release
runtime	604268	PR 35030	Mono Product Build tvOS arm64 debug
runtime	604268	PR 35030	Mono Product Build iOS x64 release
runtime	604268	PR 35030	Mono Product Build iOS x64 debug
runtime	604247	PR 34934	Libraries Build tvOS x64 Debug
runtime	604247	PR 34934	CoreCLR Product Build OSX x64 release
runtime	604247	PR 34934	Libraries Build iOS arm64 Debug
runtime	604247	PR 34934	Libraries Build tvOS arm64 Release
runtime	604247	PR 34934	Libraries Build iOS x64 Release
runtime	604243	PR 34933	Libraries Build tvOS x64 Debug
runtime	604243	PR 34933	Libraries Build iOS arm64 Debug
runtime	604243	PR 34933	Libraries Build tvOS arm64 Release
runtime	604243	PR 34933	Libraries Build iOS x64 Release
runtime	604212	PR 34825	Installer Build and Test tvOS_x64 Debug
runtime	604116	PR 34767	Libraries Build iOS arm64 Debug
runtime	604116	PR 34767	Libraries Build tvOS arm64 Release
runtime	603910	PR 35010	Libraries Build tvOS x64 Debug
runtime	603244	PR 35040	Libraries Test Run release mono OSX x64 Debug

Most recent failure 7/8/2020 6:08:00 PM

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