Feat: Include recent customer messages for new conversation

[shivamsinghchahar]

Pull Request Template

Description

Display recent messages in the notification email when a new conversation is created.

Fixes #2041

Type of change

New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Tested manually.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Screenshots

[github-actions]

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