fix: streamline JID handling by removing redundant checks and acknowledgments

[jlucaso1]

Moves the shouldIgnoreJid check from inside each handler (handleMessage, handleReceipt, handleNotification) up into processNode so ignored JIDs are acked and dropped before entering the event buffer or offline queue.

Previously every ignored message still went through the full ev.buffer()/ev.flush() cycle and handler invocation just to be discarded. In setups with many sessions in a single process this added thousands of unnecessary buffer cycles for group/broadcast messages during history sync.

Messages still get a proper ack (error 500 for messages, clean ack for receipts/notifications) matching the original behavior. Calls are excluded since they don't use shouldIgnoreJid.

[whiskeysockets-bot]

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📦 To test this PR locally:

# NPM
npm install @whiskeysockets/baileys@WhiskeySockets/Baileys#optimize-ignore-jid

# Yarn (v2+)
yarn add @whiskeysockets/baileys@WhiskeySockets/Baileys#optimize-ignore-jid

# PNPM
pnpm add @whiskeysockets/baileys@WhiskeySockets/Baileys#optimize-ignore-jid

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