dillon1000/react

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Add a feature flag to disable legacy context (#16269)

* Add a feature flag to disable legacy context

* Address review

- invariant -> warning
- Make this.context and context argument actually undefined

* Increase test coverage for lifecycles

* Also disable it on the server is flag is on

* Make this.context {} when disabled, but function context is undefined

* Move checks inside
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Dan Abramov authored 0c1ec049f8832d1c27f876844666fda393036800 Parent 95674af
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A packages/react-dom/src/__tests__/ReactDOMServerIntegrationLegacyContextDisabled-test.internal.js AddedA packages/react-dom/src/__tests__/ReactLegacyContextDisabled-test.internal.js AddedM packages/react-dom/src/server/ReactPartialRenderer.js ModifiedM packages/react-dom/src/server/ReactPartialRendererContext.js ModifiedM packages/react-reconciler/src/ReactFiberBeginWork.js ModifiedM packages/react-reconciler/src/ReactFiberClassComponent.js ModifiedM packages/react-reconciler/src/ReactFiberContext.js ModifiedM packages/shared/ReactFeatureFlags.js ModifiedM packages/shared/forks/ReactFeatureFlags.native-fb.js ModifiedM packages/shared/forks/ReactFeatureFlags.native-oss.js ModifiedM packages/shared/forks/ReactFeatureFlags.persistent.js ModifiedM packages/shared/forks/ReactFeatureFlags.test-renderer.js ModifiedM packages/shared/forks/ReactFeatureFlags.test-renderer.www.js ModifiedM packages/shared/forks/ReactFeatureFlags.www.js Modified
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