Enable generation of aka.ms links

[mmitche]

This change enables automatic generate of 'latest' aka.ms links for builds that publish installers and checksums and are applied to a channel
What this does is generate an aka.ms for the blob by stripping away version numbers. So
Runtime/5.0.0-alpha.1.20062.3/dotnet-apphost-pack-5.0.0-alpha.1.20062.3-osx-x64.pkg becomes Runtime/dotnet-apphost-pack-osx-x64.pkg. We then generate the aka.ms link as such:
dotnet/<channel>/Runtime/dotnet-apphost-pack-osx-x64.pkg -> https://dotnetfeed.blob.core.windows.net/akamslinkstest/Runtime/5.0.0-alpha.1.20062.3/dotnet-apphost-pack-5.0.0-alpha.1.20062.3-osx-x64.pkg

[mmitche]

For #3963. Testing some 'real' builds now.

[dagood]

First pass (cut a bit short by a meeting).

[dagood]

Looks like duplicated code?

[mmitche]

@dagood What code looks duplicated here?

[dagood]

arcade/src/Microsoft.DotNet.Deployment.Tasks.Links/src/AkaMSLinksManager.cs

Lines 79 to 89 in 609a83e

	using (HttpClient client = CreateClient())
	{
	using (var clientThrottle = new SemaphoreSlim(8, 8))
	{
	await Task.WhenAll(linksToDelete.Select(async link =>
	{
	try
	{
	await clientThrottle.WaitAsync();
	bool success = await retryHandler.RunAsync(async attempt =>

arcade/src/Microsoft.DotNet.Deployment.Tasks.Links/src/AkaMSLinksManager.cs

Lines 157 to 167 in 609a83e

	using (HttpClient client = CreateClient())
	{
	using (var clientThrottle = new SemaphoreSlim(8, 8))
	{
	await Task.WhenAll(links.Select(async link =>
	{
	try
	{
	await clientThrottle.WaitAsync();
	bool success = await retryHandler.RunAsync(async attempt =>

[dagood]

Some extra nitpicking. 🙂

[mmitche]

Feedback addressed.

[mmitche]

I think this is good to go now.

[JohnTortugo]

LGTM

[mmitche]

@dagood ANy other concerns?