Provide clients with analytics on their form

## Context

More clients are starting to ask for data and analytics on their users' experiences when filling out forms.

While it's currently possible to track the number of submissions, additional information like number of visits or number of people who reached X exit page (screened out) would also be beneficial information. As well as tracking UTM links.

> "does GC forms offer any kind of analytics, for example how many people click on a link to a form, how many people started and didn't complete, etc.?"

> "does GCForms have any built-in analytics to capture any activity (completion time, drop-off rates, bounce rates, etc.)"

> Including basic analytic tools (similar to Survey Monkey)

https://cds-snc.freshdesk.com/a/tickets/23894
https://gcdigital.slack.com/archives/C09CM76GCS0/p1756477537670879
https://assistance.cds-snc.ca/a/tickets/24612
https://cds-snc.freshdesk.com/a/tickets/29198
https://gcdigital.slack.com/archives/C09CM76GCS0/p1786540849803279