Add key actions related to responses to modal / form activity spreadsheet that clients can download

## Context

Key actions log work

#6575

https://docs.google.com/document/d/1uqCtN7LahS38qL9I1V7P0xQ2dvmMS1-nyqjhs4cT_XM/edit?tab=t.0#heading=h.bwmybscneuo0

## Description

Maybe it's too much to have, if we only get 100 events total displayed. But wondering, if it's feasible, could we have a log of the responses retrieved as this might be the most important action to track on a form.

For example: in terms of actions people take

> **Responses downloaded**
> EN: `Downloaded submission ${submissionID} as ${format}`
> FR: `Téléchargement de la soumission ${submissionID} en ${format}`

> **Responses confirmed**
> EN: `Confirmed response ${submissionID} `
> FR: `Confirmation de la réponse ${submissionID} `

> **Responses reported as a problem**
> EN: `Reported response ${submissionID} as a problem`
> FR: `Signalement de la réponse ${submissionID} comme ayant un problème`

We might also consider:
- Response received
- Response removed

Start by reviewing issue #6575 and the linked Google document, then trace how modal and form activity events are recorded and included in the downloadable spreadsheet. Confirm which response actions are in scope, including their English and French wording; done means the agreed actions appear correctly in the client download.

Written by the indexing model from the issue text.