feat: Add konnectivity host network configuration

[insukim1994]

Description

This PR adds configurable host network support for the Konnectivity agent by introducing a new hostNetwork field to the KonnectivitySpec configuration.

Fixes #6465

Motivation:
Currently, the Konnectivity agent's host network configuration is only controlled internally when node-local load balancing is enabled. This change allows users to explicitly control whether the Konnectivity agent should use host networking independently, providing flexibility for scenarios such as:

• Preventing CNI installation deadlocks in restricted network environments
• Troubleshooting connectivity issues
• Meeting specific network policy or compliance requirements

The feature maintains backward compatibility with hostNetwork: false as the default value.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

• Manual test
• Auto test added

Checklist

• My code follows the style guidelines of this project
• My commit messages are signed-off
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings