fix: refactor native mutation observer implementation

[pauldambra]

I'm getting test errors when merging main into #1515

TypeError: (0 , _typeUtils.isNativeFunction) is not a function

I can't see why, but I can simplify the implementation to see if a different merge works

I opened #1534 to check whether any PR would fail now, but that was fine so 🤷

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Nov 18, 2024 3:56pm

[github-actions]

Size Change: -13.8 kB (-0.44%)

Total Size: 3.11 MB

Filename	Size	Change
dist/all-external-dependencies.js	204 kB	-162 B (-0.08%)
dist/array.full.es5.js	253 kB	-442 B (-0.17%)
dist/array.full.js	356 kB	-170 B (-0.05%)
dist/array.full.no-external.js	355 kB	-170 B (-0.05%)
dist/array.js	170 kB	-816 B (-0.48%)
dist/array.no-external.js	169 kB	-814 B (-0.48%)
dist/dead-clicks-autocapture.js	13.6 kB	-112 B (-0.82%)
dist/exception-autocapture.js	8.7 kB	-744 B (-7.87%)	✅
dist/external-scripts-loader.js	2.19 kB	-686 B (-23.81%)	🎉
dist/main.js	171 kB	-816 B (-0.48%)
dist/module.full.js	355 kB	-170 B (-0.05%)
dist/module.full.no-external.js	355 kB	-170 B (-0.05%)
dist/module.js	170 kB	-816 B (-0.48%)
dist/module.no-external.js	169 kB	-816 B (-0.48%)
dist/recorder-v2.js	113 kB	-774 B (-0.68%)
dist/recorder.js	113 kB	-774 B (-0.68%)
dist/surveys-preview.js	56.6 kB	-1.58 kB (-2.72%)
dist/surveys.js	62.1 kB	-736 B (-1.17%)
dist/tracing-headers.js	1.33 kB	-1.48 kB (-52.69%)	🏆
dist/web-vitals.js	10.3 kB	-1.52 kB (-12.8%)	👏

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