Create more granular Data Dog monitoring for user submissions

[michaelclement]

As an IVC engineer I need more explicit errors in Data Dog so that I can cut down time spent categorizing and understanding errors in production.

There are three key areas that need more in-depth monitors:

1. JSON reception a. Did we receive a valid JSON object from the FE? b. Does it contain the fields we would expect? (e.g., log the keys in the object so we can verify what was provided - do NOT log the values per PII).
2. PDF generation a. Was the PDF generated? b. Is the PDF file size commensurate with a populated document? E.g., was it filled with data or is it empty? c. Did the PDF make it to S3?
3. User-facing error screen on submit a. Did the user see an error screen when submitting the form? This will help us determine if an error was represented to the user or if it was silent.

[michaelclement]

This is a top-level ticket. We will create individual ones for the targets above.

[michaelclement]

Other information we may want to surface:

• Did we get a properly formed primaryContactInfo object?
• Do we have an email address attached to the submission?
• Did the email actually go out to the user?

[baltes]

I'm going to convert this to an epic and we can add other tickets under it. I want to pull in some other fixes also.

[michaelclement]

This may be a helpful tool - Datadog Real User Monitoring lets us do session capture/replay on the frontend.