Fix: make country code button a combobox

[VladyslavBondarenko]

This is a fix for #2.

From the discussion in #100143:

I don’t think the combobox pattern suits well for this input because this number input doesn’t control the dropdown (doesn’t open or close it and the options shown in the dropdown don’t depend on the input value).
I would skip adding type="combobox" to the input. Could you please comment on whether it is ok?

The country code element should still have role="combobox" in this case. This role communicates that the component will open a listbox, and is included in the ARIA Design Pattern for a Select-Only Combobox, which seems to match what you describe.

I should have asked this before the merge.

Also fixes broken tests.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have used ESLint & Prettier to follow the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[VladyslavBondarenko]

!merge