chore: cypress test with fake angular tainting prototypes

[pauldambra]

it has been a pain to see this bug in prod and not be able to track or reproduce
let's see if CI can protect us in future

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Dec 6, 2024 0:59am

[github-actions]

Size Change: 0 B

Total Size: 3.19 MB

ℹ️ View Unchanged

Filename	Size
dist/all-external-dependencies.js	206 kB
dist/array.full.es5.js	259 kB
dist/array.full.js	362 kB
dist/array.full.no-external.js	361 kB
dist/array.js	177 kB
dist/array.no-external.js	175 kB
dist/customizations.full.js	12.5 kB
dist/dead-clicks-autocapture.js	14.3 kB
dist/exception-autocapture.js	9.37 kB
dist/external-scripts-loader.js	2.36 kB
dist/main.js	177 kB
dist/module.full.js	362 kB
dist/module.full.no-external.js	361 kB
dist/module.js	177 kB
dist/module.no-external.js	175 kB
dist/recorder-v2.js	115 kB
dist/recorder.js	115 kB
dist/surveys-preview.js	57.6 kB
dist/surveys.js	63.2 kB
dist/tracing-headers.js	1.75 kB
dist/web-vitals.js	10.3 kB

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[pauldambra]

this new test doesn't fail in webkit, and the experimental webkit support in cypress is v e r y s l o w