ReactDOM: remove unstable-native-dependencies bundle

[necolas]

This is only used by react-native-web and will be replaced by a user-space
implementation

Summary

See: necolas/react-native-web#1568

Test Plan

CI

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[sebmarkbage]

When do we actually merge this? Before the official RNW release has it or after? Seems like we should wait until there's actually an upgrade path? Since this is a breaking change, I think it'll also have to wait until we're finished releasing minors and are ready for a major.

[sizebot]

No significant bundle size changes to report.

Size changes (experimental)

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[sizebot]

No significant bundle size changes to report.

Size changes (stable)

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[necolas]

I think it'll also have to wait until we're finished releasing minors and are ready for a major

Probably. I'm expecting to get the replacement into RNW by the end of the month. This doesn't strictly need to go out in a major, since previous breaking changes in these files have occurred in patch releases. However, if there's anything else related to the plugin system that we want to remove once this is merged, then it would make sense to package it all up in a major.

[necolas]

I'm happy to merge this now, and will be responsible for managing the downstream effects.