Port of ccr/6274/add_weight_to_payload to CE

What does this MR do?

Add weight field to the hook payload.

What are the relevant issue numbers?

Closes #6274 - Weight is not included in the issue hook

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides