Incorrect session endpoint when RemoteApp option has path segments

[ocukrowicz-mtab]

Describe the bug

If RemoteApp url has path segments, for example https://devblogs.microsoft.com/dotnet/, the library removes the path segments when creating request for fetching session.

For example
https://devblogs.microsoft.com/dotnet/ would create https://devblogs.microsoft.com/fallback/adapter/session/ instead of expected https://devblogs.microsoft.com/dotnet/fallback/adapter/session/

To Reproduce

1. Set RemoteApp to url with path segments
2. Try to fetch session

Further technical details

The Uri constructor discards path segments from baseUri argument

systemweb-adapters/src/Microsoft.AspNetCore.SystemWebAdapters.SessionState/RemoteSession/RemoteAppSessionStateManager.cs

Line 38 in 9fc7391

_client.BaseAddress = new Uri(remoteOptions.RemoteAppUrl, _options.SessionEndpointPath);