fix(react-router): reset error boundary after the new matches are ready

[cristi-lng]

In the current version of the router, the error boundary is reset at the beginning of the loading phase of the new matching routes. This is a problem because the currently rendered routes can re-render while the new ones ar being in the loading process. If this is the case, the re-render will trigger the error boundary again and will void the reset.

I believe the reset should happen only after the new routes have finished loading. In this way, the reset will be in sync with the matched routes.

I don't know if this fix might have some side effects, but on our project it seems to work. If you think that this fix is not ok or you have a better solution, I would be happy to try it out.

Here is the issue I am referring to: #2162

fixes #2162
fixes #2043

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commit: 6591ebb

[schiller-manuel]

thanks a lot for your contribution!

[cristi-lng]

Thanks for the merge. I was quite busy today and didn't manage to create a unit test. Sorry about that.