Add multiple handlers per reaction and REMOVE_BROADCAST handler

[Copilot]

When users reply in a thread with "also send to channel" checked, the message violates community guidelines by appearing in both locations. The thread reaction should remove the channel broadcast while keeping the thread message, then post a reminder.

Changes

Multiple handlers per reaction

• Reactions now support types: [HANDLER1, HANDLER2] alongside legacy type: HANDLER
• Handlers execute sequentially
• Config example:

  - reaction: thread
    types:
      - REMOVE_BROADCAST
      - SLACK_POST
    message: "Please use threads..."

REMOVE_BROADCAST handler

• Detects broadcasted thread replies via thread_ts != ts
• Calls slack.remove_message() to delete from channel view
• Message persists in thread (Slack API behavior)
• No-op for regular messages and thread parents

Updated thread reaction

• Uses both REMOVE_BROADCAST and SLACK_POST handlers
• First removes broadcast if present, then posts reminder message

Implementation

Detection logic:

thread_ts = message_details.get('thread_ts')
is_broadcasted_reply = thread_ts is not None and thread_ts != ts

Handler execution in process_reaction():

action_types = reaction_config.get('types') or [reaction_config.get('type')]
for action_type in action_types:
    if action_handler := action_handlers.get(action_type):
        action_handler(event, reaction_config)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Thread please to remove it from the channel</issue_title>
<issue_description>Sometimes people use feature also send to channel. In our community guidelines it's not allowed unless really necessary. So when I leave the please thread reaction on a message that was sent to channel, I want to remove it from the channel (but keep in the thread) and also send the message we currently sending. Perhaps we can have two handlers for thread please?</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Thread please to remove it from the channel #9

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