[all] replace package.json#browsers with package.json#exports.browser

[dyladan]

We are currently using the browser property of the package.json in order to have browser overrides for node-specific functions. This field is actually not even specified by npm/node, but by webpack. As pointed out by @SimenB in #3723 (reply in thread) this causes issues with at least Jest and likely other build tools.

We should switch to use the more modern conditional exports with a browser stanza in order to ensure greater compatibility with more tools and runtimes.

[github-actions]

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