fix(browser): support more browsers

[edoardocavazza]

Description

This PR solves #4304 adding the es2017 target to builds and polyfilling globalThis in html entrypoints.

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[sheremet-va]

We should not polyfill anything by default.

[edoardocavazza]

I see. I've removed the polyfill for globalThis, which will narrow down the list of supported browsers a bit, particularly excluding Safari versions up to 12.2, but I think it should still work.

[sheremet-va]

Should we also add spy package here?