chore: babel targets in rollup config

[pauldambra]

we should configure the rollup babel plugin with our browserlist targets.

it uses them to figure out what it should and shouldn't do...

in theory it helps reduce bundle size - but it can't hurt

discovered while investigating IE11 support in #1478

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Oct 16, 2024 10:28pm

[github-actions]

Size Change: -1.93 kB (-0.07%)

Total Size: 2.83 MB

Filename	Size	Change
dist/all-external-dependencies.js	192 kB	-90 B (-0.05%)
dist/array.full.js	355 kB	-206 B (-0.06%)
dist/array.full.no-external.js	354 kB	-206 B (-0.06%)
dist/array.js	169 kB	-164 B (-0.1%)
dist/array.no-external.js	168 kB	-164 B (-0.1%)
dist/exception-autocapture.js	11.3 kB	-30 B (-0.26%)
dist/main.js	170 kB	-164 B (-0.1%)
dist/module.full.js	355 kB	-206 B (-0.06%)
dist/module.full.no-external.js	354 kB	-206 B (-0.06%)
dist/module.js	169 kB	-164 B (-0.1%)
dist/module.no-external.js	168 kB	-164 B (-0.1%)
dist/recorder-v2.js	111 kB	-57 B (-0.05%)
dist/recorder.js	111 kB	-57 B (-0.05%)
dist/surveys-preview.js	59.8 kB	-17 B (-0.03%)
dist/surveys.js	66 kB	-18 B (-0.03%)
dist/web-vitals.js	10.3 kB	-13 B (-0.13%)

ℹ️ View Unchanged

Filename	Size
dist/external-scripts-loader.js	2.35 kB
dist/tracing-headers.js	8.36 kB

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