Fixed 'Setup SSH' issues

[MichaelKoster70]

• Added more logging
• Added a second method for accepting server fingerprints in case ssh-scankey fails
• fix issue where empty port was allowed
  Fixes SSH Connection Issue: "Could not resolve hostname" #86

[Copilot]

Pull request overview

This PR addresses issues in the SSH setup functionality by improving error handling and adding a fallback mechanism for server fingerprint acceptance. The key improvements include enhanced logging throughout the SSH connection process, implementing a secondary method using direct SSH connections when ssh-keyscan fails, and fixing a validation bug that previously allowed empty port numbers.

Key Changes:

• Added fallback SSH connection method when ssh-keyscan fails to retrieve server fingerprints
• Fixed port validation to prevent empty values from being accepted
• Enhanced logging and error reporting throughout the SSH setup workflow

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
Resources.resx	Added new localized strings for enhanced logging messages and error reporting in SSH setup
SetupSshDialogWindow.xaml.cs	Added exception filter callback to capture binding validation errors for port field
SetupSshDialogWindow.xaml	Updated port TextBox binding to include exception validation and custom error filter
HostPortValidationRule.cs	Enhanced validation logic to reject empty port values and handle both string and integer inputs
SetupSshViewModel.cs	Added method to report binding exceptions and integrated validation error checking in command execution
SecureShellKeySetupService.cs	Implemented fallback SSH connection method for fingerprint acceptance and refactored fingerprint registration into separate methods
RemoteDebuggerLauncher.csproj	Added references to new infrastructure classes for pseudo console and string handling
PackageConstants.cs	Added constants for SSH executable and arguments used in fallback connection method
StringBuilderExtensions.cs	New utility class to strip ANSI/VT escape sequences from console output
PseudoConsoleProcess.cs	New class implementing Windows pseudo console for interactive SSH sessions
NativeMethods.cs	New class with P/Invoke declarations for Windows console and process creation APIs

Files not reviewed (1)

• src/Extension/RemoteDebuggerLauncherUI/Resources.Designer.cs: Language not supported

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