[BREAK][ENTERPRISE] Missing headers in CSV files downloaded from the Engagement Dashboard

[matheusbsilva137]

Proposed changes (including videos or screenshots)

• Add headers to all CSV files downloaded from the "Messages" and "Channels" tabs from the Engagement Dashboard;
• Add headers to the CSV file downloaded from the "Users by time of day" section (in the "Users" tab).

Issue(s)

Task - ClickUp

Steps to test or reproduce

Go to Administration > Engagement Dashboard. All the files downloaded from the "Messages", "Channels" and "Users" tabs should contain headers.

Further comments