fix: Add disabled choices support for dialog dropdown #1959

[marek-mihok]

This PR brings 2 fixes:

• it adds support for disabled choices in a dialog dropdown:

https://user-images.githubusercontent.com/23740173/235901449-8622e2ef-d917-438d-b88b-3c729b87049e.mov

• it fixes Select all/Deselect all behavior for base dropdown:

https://github.com/h2oai/wave/assets/23740173/932e8557-5f56-44a2-be00-dce9323df2e1

Closes #1959 Closes #1963

[marek-mihok]

What is submitted if I specify the disabled choice as checked initially and then do my selection for other (non-disabled) choices? Is the initial disabled choice part of the final submission or not?

@mturoci it is but for dialog dropdown only.

https://user-images.githubusercontent.com/23740173/237037407-0a3202b2-bcd3-481e-b8f1-6266369ecb16.mov

For base dropdown it is only when doing selections manually but it is not when using Select all/Deselect all. Since this issue relates to dialog dropdown only, I've created a separate issue for the base dropdown last week.

[mturoci]

it is but for dialog dropdown only.

Both dialog and regular dropdown must always be in sync so let's fix them both in this PR.

[marek-mihok]

@mturoci, both of them are fixed now.