Dropdown: Fix disabled behavior on dropdown element

[austinoneil]

Description

Fix disabled behavior on dropdown element. Adds disabled to toggle element and prevents actions when disabled.

References #2419

Type of change

• 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 not work as expected)
• Documentation update

How Has This Been Tested?

Manual using existing Storybook implementation, e2e tests

https://deploy-preview-2456--moduswebcomponents.netlify.app/?path=/story/components-dropdown--default&args=disabled:true

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

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[coliff]

This is great - thank you! It'd be great to add the CSS pointer-events: none when disabled.