Remove UNSAFE_componentWillMount and fix initialValues not passed to validation

[sanex3339]

Remove UNSAFE_componentWillMount and fix initialValues not passed to validation.

Issues: #4628, #4642
Partially ported from shanshanzhu@d59ea8e

Updated React development version to 17.0.2

[sanex3339]

@erikras hi, as we discussed, please check this.
Still 4 UNSAFE lifecycle methods are left, i'm not sure how to rewrite them, tests are failing.

[Cetlan]

Maybe outside the scope of this fix, but to be (perhaps a bit too) blunt, the problem here is #4020 It might have fixed a bug with the wrong values being passed in under one particular set of conditions - but completely broke the behaviour of initial setup, where previously the values prop was set up to be the intialValues when first set up, and now it's set up to be an empty object because the initialization logic was inverted without account for the reason it was written that was in the first place.

So, validation not getting initialValues is just the symptom that everyone has started to notice about that change, but anything that relies on values could be broken. I won't pretend to know enough of the redux-form code to know if your fix is general enough to account for that, but as I spent days trying to understand why upgrading redux-form broke the application I'm working with, I figured I'd make note of the more general possible problem since you're working on it.

[sanex3339]

@shanshanzhu please check this too, because it based in your changes

[shanshanzhu]

@sanex3339 LGTM

[dominikduda]

Is there any ETA of when will this be released?

[jaketrimble]

Checking in on an ETA for release. Thanks!

[vladkosinov]

@erikras @iamandrewluca is there a chance this PR or #4728 will be merged?

[sbaechler]

This would also fix parts of #4373 and #3954

[kimyu92]

@erikras May you review this PR to enable React 17 support to prevent it falling behind too far especially React 18 has been out for a few months? 🙏

[gaievskyi]

@erikras UP 🙏

[sanex3339]

👍

[haradakunihiko]

@erikras May I ask when this will be released? I am eagerly awaiting this fix.

[erikras]

Published in v8.3.10.