fix(Button): Set the native disabled attribute

[davidkbh]

… events

Description

When we set up a element as a Button.ts component, we want to ensure the native disabled attribute is still set - as this is the best way of blocking keyboard tabbing access to the button.

Verify that...

• Any related demos were added and npm start and npm run build still works
• New demos work in Safari, Chrome and Firefox
• npm run lint passes
• npm test passes and code coverage is increased
• npm run build still works

Bullhorn Internal Developers

• Run Novo Automation

Screenshots

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