CV2-5301: add a report published_at to CSV export file

[melsawy]

Description

• Change Published at column label to Social Media Posted at
• Add column Report Published at

References: CV2-5301

How has this been tested?

Re-run automated tests.

Checklist

• I have performed a self-review of my own code
• I have added unit and feature tests, if the PR implements a new feature or otherwise would benefit from additional testing
• I have added regression tests, if the PR fixes a bug
• I have added logging, exception reporting, and custom tracing with any additional information required for debugging
• I considered secure coding practices when writing this code. Any security concerns are noted above.
• I have commented my code in hard-to-understand areas, if any
• I have made needed changes to the README
• My changes generate no new warnings
• If I added a third party module, I included a rationale for doing so and followed our current guidelines

[caiosba]

Looks good, thanks Sawy. Let's keep an eye to see if, for big exports, storing pm_report in memory will be an issue. If so, we can load this information one by one, since it runs in background anyway.