Fixes bug in the EuiCheckboxGroup demo page and add disabled to TS defs

[ffknob]

Related to #2538

Fixes bug in the EuiCheckboxGroup demo page in which both enabled and disabled groups were using the same ids for their checkbox input components, which caused the disabled ones to be checkable

Checklist

• [ ] Checked in dark mode
• [ ] Checked in mobile
• [ ] Checked in IE11 and Firefox
• [ ] Props have proper autodocs
• Added documentation examples
• [ ] Added or updated jest tests
• [ ] Checked for breaking changes and labeled appropriately
• [ ] Checked for accessibility including keyboard-only and screenreader modes
• A changelog entry exists and is marked appropriately

[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[cchaos]

Thanks for that change @ffknob .

One of the things we use the documentation page for is to visually test the different states of a component. With all the disabled checkboxes being unchecked now, we can't visually see what the state of a disabled and checked checkbox would look like. That's most likely the reason we kept the id's the same which is simply to check the look of this state.

Could you look into creating a different checkboxIdToSelectedMap state for the disabled options and by default set one of them to checked?

[ffknob]

Thanks for that change @ffknob .

One of the things we use the documentation page for is to visually test the different states of a component. With all the disabled checkboxes being unchecked now, we can't visually see what the state of a disabled and checked checkbox would look like. That's most likely the reason we kept the id's the same which is simply to check the look of this state.

Could you look into creating a different checkboxIdToSelectedMap state for the disabled options and by default set one of them to checked?

How about that?

[cchaos]

That's great, thank you!

[cchaos]

Jenkins, test this