Upgrade to React 18

[twschiller]

Context:

• Upgrade guide: https://reactjs.org/blog/2022/03/08/react-18-upgrade-guide.html
• If there's not anything we urgently need, let's give some time for our other dependencies (react-select, etc.) to do patch releases as necessary

Implementation Sketch

• Update react/react-dom and type libraries
• Update dependencies to version supporting React 18, e.g., react-bootstrap, react-select, etc.

Considerations:

• PSA: React 18 calls code twice in strict dev mode to detect side effects. Discussion on HN: https://news.ycombinator.com/item?id=30976040

[twschiller]

Related: #3179

[fregante]

Likely blocked by:

• Add react 18 to peer dependencies rjsf-team/react-jsonschema-form#2976

The issue is closed, but a stable v5 hasn't been released yet: https://github.com/rjsf-team/react-jsonschema-form/releases

Related but not blocking:

• Upgrade to React Router v6 #1851

[github-actions]

This issue will be closed in 7 days unless the stale label is removed, or a comment is added to the issue.

[fregante]

Also blocked by a dead project:

• When will the support come for react@18? supasate/connected-react-router#612

Related:

• Upgrade to React Router v6 #1851 (comment)

[github-actions]

This issue will be closed in 7 days unless the stale label is removed, or a comment is added to the issue.