Add eslint rules for accessibility

[timroes]

We should add some eslint rules to check for some common accessibility issues. That way we can prevent custom mistakes from being committed and make Jenkins automatically check.

This might also be easier then adding automated accessibility tests (#13758), but could provide similar benefits for that common issues (like missing labels, etc.).

There is an eslint plugin for JSX, calld eslint-plugin-jsx-a11y which seems to be pretty popular.

[jbudz]

I see some now!

kibana/packages/eslint-config-kibana/package.json

Line 21 in af2da97

"eslint-plugin-jsx-a11y": "^6.1.2",

:)