Upgrade to ESLint v9, fix all React issues

[colinrotherham]

This PR upgrades to ESLint v9 and removes the following disabled rules:

rules: {
  'react/prop-types': 0,
  'jsx-a11y/anchor-has-content': 0,
  'jsx-a11y/alt-text': 0,
  'jsx-a11y/heading-has-content': 0,
  'react-hooks/exhaustive-deps': 0,
},

They've now been fixed instead

Other linting tasks

The following linting tasks have been split out for convenience:

yarn lint:types
yarn lint:js
yarn lint:prettier

[colinrotherham]

Thanks @JoshuaBates-NHS, just going to update TypeScript as well

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
1.5% Duplication on New Code

See analysis details on SonarQube Cloud