[Slack] Read message cross channels

[ShihChun-H]

Issue Description

Current State

• Slack cannot read message across different channels

Why We Want to Change?

• Users want to build a pipeline for the similar channels with only one Slack component.
  • For example, in InstillAI, we have dev-xxx channels that we could want to have the same automation flow.

Proposed Change

• prefix / suffix of channel name for users to scan the channels

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INS-6354 [Slack] Read message cross channels