Add Google Analytics event / logging for users blocked by captcha / flagged as suspicious

## Context
https://gcdigital.slack.com/archives/C03T4FAE9FV/p1756219722524359

- Current logs and errors are minimal.
- Intent was to simply give a sense of app health.
- Observing would be done through hCAPTCHA analytics
- We have use cases for specific forms needing troubleshooting.

## Description

We need improved visibility into when / how often Captcha is being triggered by end users, as there are a few data points that indicate it may be blocking legitimate users from being able to submit.

- Adding a Google Analytics (GA) event related to when a user is flagged as suspicious and adding the form ID in the data.
- Assessing whether "unusual" form users with extra security settings coincide with captcha events.