Capture error details of "remote unpack failed"

[Pavel Savara]

Reproduction steps

• create Azure DevOps repo with security rules enabled
• create commit which violates server rules. For example appsettings.json

{
    "Parameters": {
        "note": "this will trigger secret warning in the Azdo push, which is what I'm testing for",
        "secret": "opensesame"
    }
}

I configure the repo.Network.Push this way

var po = new PushOptions()
{
    CredentialsProvider = (_, _, _) => AzdoCreddentials,
                
    OnPushStatusError = (reason) =>
    {
        mainLogger.Log(LogLevel.Error, "Push failed with {}", reason.Message);
    },
};

Expected behavior

Make PushOptions.OnPushStatusError or another callback to receive details of remote unpack failure similar to git CLI

Specifically error: remote unpack failed: error VS403654: The push was rejected because it contains one or more secrets. in the log below.

PS C:\Dev\dotnet-mirroring\sandbox\pavelsavara-runtime> git push
Enumerating objects: 4, done.
Counting objects: 100% (4/4), done.
Delta compression using up to 20 threads
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 406 bytes | 406.00 KiB/s, done.
Total 3 (delta 1), reused 3 (delta 1), pack-reused 0 (from 0)
remote: Analyzing objects... (3/3) (27 ms)
remote: Validating commits... (1/1) done (0 ms)
remote: Checking for credentials and other secrets...  done (59 ms)
error: remote unpack failed: error VS403654: The push was rejected because it contains one or more secrets.
To https://dev.azure.com/dnceng/internal/_git/pavelsavara-runtime
 ! [remote rejected]         browser_firefox_shm -> browser_firefox_shm (VS403654: The push was rejected because it contains one or more secrets.

Resolve the following secrets before pushing again. For help, see https://aka.ms/1ESSecretScanning.

Actual behavior

LibGit2Sharp.LibGit2SharpException: unpacking the sent packfile failed on the remote with no more details

Version of LibGit2Sharp (release number or SHA1)

0.29.0

Operating system(s) tested; .NET runtime tested

• windows 10
• SDK 9.0.100-preview.1.24101.2