fix(gateway/telegram): use quoted fragment over full reply text

[j2h4u]

What

When a user selects and cites a specific fragment of a message in Telegram (partial quote), the cited text is available in message.quote.text (a TextQuote object). The gateway was ignoring this and always using the full reply_to_message.text instead.

Why

Telegram's partial quote feature lets users highlight exactly the words they're replying to. Passing the full message text as reply context is misleading — the agent receives far more text than the user intended to reference.

Change

# Before
reply_to_text = message.reply_to_message.text or message.reply_to_message.caption or None

# After
if message.quote and message.quote.text:
    reply_to_text = message.quote.text
else:
    reply_to_text = message.reply_to_message.text or message.reply_to_message.caption or None

message.quote is None when the user replies without selecting a fragment (standard reply), so existing behaviour is fully preserved as a fallback.

How to test

1. Send a long message to the bot
2. In Telegram, select a short fragment of that message and reply to it (partial quote)
3. Verify that reply_to_text in the resulting MessageEvent contains only the selected fragment, not the full message

Tested on: Linux (python-telegram-bot 22.6)

[alt-glitch]

Duplicate of #22676 (already merged). This PR implements the same message.quote.text fix that landed in #22676. Also duplicates open #22709.

[j2h4u]

Closing — upstream fixed the same issue independently in the same release batch (#22619). The fix is now in main.