Code Review Bench PR #25799 - Removed xmlrpc/pingomatic ping service

[tomerqodo]

Code Review Bench PR TryGhost#25799

Original PR Title: Removed xmlrpc/pingomatic ping service
Original PR Description: Pingomatic is a legacy blog ping service that notified external services when posts were published. It is no longer relevant for modern SEO or content distribution.

The service was disabled by default and added unnecessary complexity to the codebase.

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• What does it do?
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Note

Removes the obsolete XML-RPC ping service (Pingomatic) from core and config.

• Deletes server/services/xmlrpc.js and its unit tests
• Drops xmlrpc.listen() and the xmlrpc require from boot.js
• Removes privacy.useRpcPing from config.development.json

No other services or boot order affected.

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Original PR URL: TryGhost#25799