This PR updates the Unleash UI to use the new environment limit.
As it turns out, we already had an environment limit in the UI, but it
was hardcoded (luckily, its value is the same as the new default value
🥳).
In addition to the existing places this limit was used, it also disables
the "new environment" button if you've reached the limit. Because this
limit already exists, I don't think we need a flag for it. The only
change is that you can't click a button (that should be a link!) that
takes you to a page you can't do anything on.
**Upgrade to React v18 for Unleash v6. Here's why I think it's a good
time to do it:**
- Command Bar project: We've begun work on the command bar project, and
there's a fantastic library we want to use. However, it requires React
v18 support.
- Straightforward Upgrade: I took a look at the upgrade guide
https://react.dev/blog/2022/03/08/react-18-upgrade-guide and it seems
fairly straightforward. In fact, I was able to get React v18 running
with minimal changes in just 10 minutes!
- Dropping IE Support: React v18 no longer supports Internet Explorer
(IE), which is no longer supported by Microsoft as of June 15, 2022.
Upgrading to v18 in v6 would be a good way to align with this change.
TS updates:
* FC children has to be explicit:
https://stackoverflow.com/questions/71788254/react-18-typescript-children-fc
* forcing version 18 types in resolutions:
https://sentry.io/answers/type-is-not-assignable-to-type-reactnode/
Test updates:
* fixing SWR issue that we have always had but it manifests more in new
React (https://github.com/vercel/swr/issues/2373)
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Co-authored-by: kwasniew <kwasniewski.mateusz@gmail.com>
