Track Zuora CC validation events

What does this MR do and why?

In order to help us in mitigating https://gitlab.com/gitlab-com/gl-infra/production/-/issues/6709 we need to collect data where we show the CC validation iframe and it's result.

Screenshots or screen recordings

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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