Include Matomo-client for tracking default metrics

[elwinschmitz]

AB#33700

Describe your changes

• Load the Matomo-client only when necessary
• Include all the necessary deployment-configuration
• Limit all features that would require cookies/privacy-notices, etc.

Checklist before requesting a review

• I have performed a self-review of my code
• I have added tests wherever relevant
• I have made sure that all automated checks pass before requesting a review
• I do not need any deviation from our PR guidelines

Preview deployment

https://lively-river-04adce503-6535.westeurope.5.azurestaticapps.net

[aberonni]

There are some small things that I'd like to refactor - but I'll do that in a separate PR because the implementation here looks very solid and thorough (I especially like the attention to detail in the .mjs files). So I'm merging as-is so hopefully we can tracking data and in the meantime do the refactor separately. (Why refactor? This question will be answered in the new PR).