[java] deprecate FtpProxy by Delta456 · Pull Request #15907 · SeleniumHQ/selenium

🎫 Ticket compliance analysis ✅

15905 - PR Code Verified

Compliant requirements:

• Deprecate FTP Proxy support from Java binding
• Address the fact that FTP Proxy is no longer supported by browsers

Requires further human verification:

• Verification that deprecation is applied to all other bindings (C-py, C-rb, C-dotnet, C-nodejs)
• Confirmation that future removal timeline is established