SSH ProxyJump connections fail due to shared sshClient authentication state #3942
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This PR fixes SSH authentication issues when using ProxyJump by improving session isolation and connection lifecycle management.
Key changes
Disabled connection reuse when ProxyJump is enabled to prevent authentication state leakage.
Scoped SSH credentials strictly to individual ClientSession instances.
Ensured SSH client resources are properly cleaned up for non-cached sessions.
Prevented mixed authentication attempts that could lead to “Too many authentication failures”.
These changes make SSH connections more stable and predictable, especially in proxy-based environments.
Fixes #3926