Move from enzyme to react testing library

[kr8n3r]

What

• Replace the use of Enzyme and enzyme-react-adaptor with React Testing Library (RTL)
• Rewrite all necessary view tests to RTL syntax.

Why

We use React 18 but Enzyme react adaptor only supports 16. This wasn't an issue until this week our builds started failing to build (see below)

Enzyme seems to be dying a slow death, as there isn't even a react 17 adapter. Meanwhile RTL fully supports React 18 and we want to be able to upgrade in the future.

while resolving: enzyme-adapter-react-16@1.15.6
npm ERR! Found: react@18.1.0
npm ERR! node_modules/react
npm ERR!   react@"^18.1.0" from the root project
npm ERR!   peer react@"^18.1.0" from react-dom@18.1.0
npm ERR!   node_modules/react-dom
npm ERR!     react-dom@"^18.1.0" from the root project
npm ERR!   1 more (react-markdown)
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer react@"^16.0.0-0" from enzyme-adapter-react-16@1.15.6
npm ERR! node_modules/enzyme-adapter-react-16
npm ERR!   dev enzyme-adapter-react-16@"^1.15.6" from the root project
npm ERR! 
npm ERR! Conflicting peer dependency: react@16.14.0
npm ERR! node_modules/react
npm ERR!   peer react@"^16.0.0-0" from enzyme-adapter-react-16@1.15.6
npm ERR!   node_modules/enzyme-adapter-react-16
npm ERR!     dev enzyme-adapter-react-16@"^1.15.6" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

Migrating to @testing-library is the only logical option. Downgrading React isn't an option.

Addresses #2748

How to review

• tests pass - as we have coverage enabled and rewritten tests need to cover the code as before. If all is green, then coverage is the same
• review code by commit (easiest to see changes)

Who can review

not @kr8n3r

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🚨⚠️ Please do not merge this pull request via the GitHub UI ⚠️🚨

[schmie]

Sampled equivalence of checks, some new TS complaints, but all suites passing - LGTM 👍