ADO Server - Ability to authenticate using agent identity to ADO Artifacts feed

I am using ModuleFast in ci/cd to query and download powershell modules from local ADO Artifacts feed.
The feed uses Powershell Gallery as upstream and functions as local cache.

HTTP2/3 prevents the agent to authenticate to the feed using NTLM/Kerberos.
I know that there is the option of using PATs with basic authentication, still for our use case HTTP1.1 with classic authentication makes it easier to manage.
The change only require a flag that affects following 3 lines:

```

function New-ModuleFastClient {
param(
[PSCredential]$Credential,
[int]$Timeout = 30
)
Write-Debug 'Creating new ModuleFast HTTP Client. This should only happen once!'
$ErrorActionPreference = 'Stop'
#SocketsHttpHandler is the modern .NET 5+ default handler for HttpClient.

$httpHandler = [SocketsHttpHandler]@{
#The max connections are only in case we end up using HTTP/1.1 instead of HTTP/2 for whatever reason. HTTP/2 will only use one connection (but multiple streams) per the spec unless EnableMultipleHttp2Connections is specified
MaxConnectionsPerServer = 10
#Reduce the amount of round trip confirmations by setting window size to 64MB. ModuleFast should primarily be used on reliable fast connections. Dynamic scaling will reduce this if needed.
InitialHttp2StreamWindowSize = 16777216
AutomaticDecompression = 'All'
ADD>>>>>> Credentials = [System.Net.CredentialCache]::DefaultNetworkCredentials
}

$httpClient = [HttpClient]::new($httpHandler)
$httpClient.BaseAddress = $Source
#When in parallel some operations may take a significant amount of time to return
$httpClient.Timeout = [TimeSpan]::FromSeconds($Timeout)

#If a credential was provided, use it as a basic auth credential
if ($Credential) {
$httpClient.DefaultRequestHeaders.Authorization = ConvertTo-AuthenticationHeaderValue $Credential
}

#This user agent is important, it indicates to pwsh.gallery that we want dependency-only metadata
#TODO: Do this with a custom header instead
$userHeaderAdded = $httpClient.DefaultRequestHeaders.UserAgent.TryParseAdd('ModuleFast (github.com/JustinGrote/ModuleFast)')
if (-not $userHeaderAdded) {
throw 'Failed to add User-Agent header to HttpClient. This is a bug'
}

#This will multiplex all queries over a single connection, minimizing TLS setup overhead
#Should also support HTTP/3 on newest PS versions
REMOVE>>>>>>$httpClient.DefaultVersionPolicy = [HttpVersionPolicy]::RequestVersionOrHigher
#This should enable HTTP/3 on Win11 22H2+ (or linux with http3 library) and PS 7.2+
REMOVE>>>>>>[void][AppContext]::SetSwitch('System.Net.SocketsHttpHandler.Http3Support', $true)
return $httpClient
}

```