Slack: align Cortex Assistant messaging with updated assistant mechanism

[mmhw]

Contributing to Cortex XSOAR Content

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Description

Must have

• Tests
• Documentation

[content-bot]

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[content-bot]

Validate summary
The following errors were thrown as a part of this pr: RN107.
The following errors can be ignored: RN107.
The following errors don't run as part of the nightly flow and therefore can be force merged: RN107.
If the AG100 validation in the pre-commit GitHub Action fails, the pull request cannot be force-merged.

Verdict: PR can be force merged from validate perspective? ✅

[content-bot]

🔍 AI Triage Report Available

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Status: failed
Report ID: 8d9023b5516c3708

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