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Downgrade deprecation warnings from errors to warnings (#9650)
* Initial regeneration of results.json **what is the change?:** We ran `yarn build` and updated the perf. stats record. **why make this change?:** Some commits have landed without updating this. By getting an initial update, I can run the build script again after my changes and see any size regressions. * Downgrade deprecation warnings from errors to warnings **what is the change?:** Swapping out `warning` module for a fork that uses `console.warn`. It looks like we were using the `warning` module for deprecation notices, *but* there is also a 'deprecated' module designed specifically for deprecation notices. However, we could not find any place that it was currently used. Since React's build process is not 100% clear to me, I assume it could still be used somewhere by something and just updated it along with other deprecation notices. We might consider a follow-up diff that does some clean up here; - remove 'deprecated' module if it's unused, OR - use 'deprecated' module for all our current deprecation warnings **why make this change?:** - We have had complaints about noisy warnings, in particular after introducing new deprecations - They potentially cause CI failures - Deprecations are not really time-sensitive, can ship without breaking your app, etc. For more context - #9395 **test plan:** `npm run test` and unit tests for the new modules and manual testing (WIP) **issue:** #9395 * Add 'lowPriorityWarning' to ReactExternals **what is the change?:** We won't bundle 'lowPriorityWarning' with the rest of React when building for Facebook. NOTE: A parallel commit will introduce an internal implementation of 'lowPriorityWarning' in Facebook's codebase, to compensate. Will post a comment with the diff number once that is up. **why make this change?:** So that the sync between github and Facebook can go more smoothly! **test plan:** We will see when I run the sync! But this is a reasonable first step imo. **issue:** #9398 * Make state mutations an error, not low-pri warning **what is the change?:** Even though this is a "deprecation" warning, we still want to use 'console.error' for it. **why make this change?:** - It's not likely to come up now, hopefully, because this warning has been present for some time - This will cause real issues in production if ignored **test plan:** `yarn test` - we did fix one test which failed bc of this change **issue:** #9398 * Fix test of assigning to this.state that was only passing in fiber **what is the change?:** updated a unit test for assigning directly to state; it once again raises an error and not a warning. **why make this change?:** So that tests pass **test plan:** REACT_DOM_JEST_USE_FIBER=1 yarn run test **issue:** * Update results.json
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