* fix(slack): remove message.channels/message.groups handlers that crash Bolt 4.6
Bolt 4.6 rejects app.event() calls with event names starting with
"message." (e.g. "message.channels", "message.groups"), throwing
AppInitializationError on startup. These handlers were added in #31701
based on the incorrect assumption that Slack dispatches typed event
names to Bolt. In reality, Slack always delivers events with
type:"message" regardless of the Event Subscription name; the
channel_type field distinguishes the source.
The generic app.event("message") handler already receives all channel,
group, IM, and MPIM messages. The additional typed handlers were
unreachable even if Bolt allowed them, since no event payload ever
carries type:"message.channels".
This preserves the handleIncomingMessageEvent refactor from #31701
(extracting the handler into a named function) while removing only
the broken registrations.
Fixes the Slack provider crash loop affecting all accounts on
@slack/bolt >= 4.6.0.
Closes#31674 (original issue was not caused by missing handlers)
* fix: document Slack Bolt 4.6 startup handler fix (#32033) (thanks @mahopan)
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Co-authored-by: Peter Steinberger <steipete@gmail.com>
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