GROWENG-3933 refactor dataLayer.push for GA4 structure

[laszlokajtar]

Done

• Refactored sendContributionFormAnalytics function not to send multiple GAEvent pushes to the dataLayer but to send one push with the data as key-value pairs within that push in order to respect GA4 event parameter data model

QA

• Check out this feature branch
• Run the site using the command ./run serve or dotrun
• View the site locally in your web browser at: http://0.0.0.0:8001/
  • Be sure to test on mobile, tablet and desktop screen sizes
• Visit https://ubuntu.com/download/desktop/thank-you?version=24.04&architecture=amd64&lts=true
• Click on contribution with various contribution amount settings (including 0)
• Check the value of the dataLayer array in the console whether the "contribution" event object in the array appears and whether it has the correct data

Help

QA steps - Commit guidelines

[webteam-app]

laszlokajtar is not a collaborator of the repo

[samhotep]

A few checks are failing, but otherwise seems good! @laszlokajtar

[laszlokajtar]

@samhotep prettier fails to run for me so i can't really correct formatting. (i'm not sure what playwright is trying to do...) any way this can be merged?