Add database constraints for Mattermost Slash Commands fields

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Summary

Description:

Add database-level constraints to Mattermost Slash Commands integration fields to match the existing model validations and ensure data integrity.

Implementation Details:

• Add length constraints to the chat_names table.
• Need to investigate the appropriate length limits - these should align with what's currently enforced in the ChatName model validations
• This provides an additional layer of data validation at the database level

Acceptance Criteria:

• Create migration to add length constraints to the specified columns
• Ensure constraints align with model validation limits
• Test that the constraints work as expected for new and existing records