fix(userEvent): don't select option if select is disabled

[nickserv]

Migrated from testing-library/user-event#344 by @ben-dyer

What: Prevent a select's value from changing with selectOptions if it is disabled

Why: It's possible to change the value of a disabled select using selectOptions. For instance this is passing:

  const {
    container: {firstChild: select},
  } = render(
    <select disabled>
      <option>No value selected</option>
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>,
  )

  expect(select.selectedIndex).toBe(0)

  userEvent.selectOptions(select, '1')
  expect(select.selectedIndex).toBe(1)

How: Exit early in selectOptions if the element is disabled, similar to what is done in clear and upload

Checklist:

• Documentation added to the
  docs site N/A
• Tests
• Typescript definitions updated N/A
• Ignore disabled options
• Ready to be merged
  

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[kentcdodds]

Looks great, just one thing.

[kentcdodds]

Solid. Thank you!