Add GlobalProtect SAML based authentication support with OpenConnect VPN
Pass HTTP response headers to libopenconnect SAML handling functionality. libopenconnect will process the headers and authenticate with GlobalProtect gateways.
This change depends on Qt>=6.6 for the needed changes in QtWebEngine that enable HTTP response header extraction.
BUG: 444500 Signed-off-by: Rahul Rameshbabu sergeantsagara@protonmail.com