chore: fix the rollup bundle visualiser output

[pauldambra]

When we last changed the rollup bundling - I think - we started writing a bundle file for each entrypoint but all with the same name

I think I'm the only person that uses this but I do use it, so this changes to output a file for every bundle with its own name.

We can use this primarily to see what is causing array.js to grow but can also then dig into each of the bundles if we need to

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Jul 23, 2024 2:10pm

[github-actions]

Size Change: 0 B

Total Size: 1.16 MB

ℹ️ View Unchanged

Filename	Size
dist/array.full.js	330 kB
dist/array.js	152 kB
dist/exception-autocapture.js	10.4 kB
dist/main.js	153 kB
dist/module.js	152 kB
dist/recorder-v2.js	110 kB
dist/recorder.js	110 kB
dist/surveys-preview.js	59.6 kB
dist/surveys.js	64.8 kB
dist/tracing-headers.js	8.26 kB
dist/web-vitals.js	5.79 kB

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