Replace disabled attribute assertion with relaxed one

What does this MR do and why?

This MR does 3 following things:

• adds eslint rule to complain about using expect(something.attributes('disabled')).toBe('true')
  • rule triggers - using .attributes('disabled') and .toBe('ANY_STRING_LITERAL')
• fixes all offenses by using regexp search & replace
  • \.attributes\('disabled'\)\)\.toBe\('[^']+'\) ▶ .attributes('disabled')).toBeDefined()
  • \.attributes\('disabled'\)\)\.not.toBe\('[^']+'\) ▶ .attributes('disabled')).toBeUndefined()

This is required because Vue.js 3 no more does some dirty attributes magic, so let's stick to HTML behaviour

How to set up and validate locally

• checkout
• run yarn jest

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.