Add support for Include directive in SSH config parser (#19555)

[AbhishekGiri04]

Summary of the Pull Request

Adds support for the Include directive in SSH config parser, enabling Terminal to generate profiles from split SSH configuration files (e.g., Include config.d/*).

References and Relevant Issues

Fixes #19555

Detailed Description of the Pull Request / Additional comments

This PR implements SSH config Include directive support with the following features:

Changes:

• Added Include directive parsing in SshHostGenerator::_getHostNamesFromConfigFile()
• Implemented _processIncludeDirective() to handle file inclusion with wildcard pattern support
• Added _matchesPattern() for wildcard matching (* and ? patterns)
• Recursively processes included config files relative to the parent config directory

Behavior:

• Supports direct includes: Include ~/.ssh/config.d/work
• Supports wildcard includes: Include config.d/*
• Handles relative paths from config file location
• Maintains backward compatibility with existing configs

Implementation:

• Modified: SshHostGenerator.cpp (+107 lines)
• Modified: SshHostGenerator.h (+2 function declarations)

Validation Steps Performed

• Tested with direct file includes
• Tested with wildcard patterns (config.d/*)
• Verified recursive parsing of included files
• Confirmed profiles generated correctly from split configs

PR Checklist

• Closes Add support for includes in SSH profile generator #19555
• Tests added/passed
• Documentation updated
• Schema updated (if necessary)

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