[extensions] Add styling for the approved and published toolbar button

[roland-d]

On the extension edit view we have 2 modal buttons:

• Approved State
• Published State

These buttons get different classes based on their status. This used to work on Joomla 3 but in Joomla 4, all button CSS are overruled and backgrounds are made white. The real color only shows on hover however we want to show this immediately.

Have a look at these 2 toolbar button overrides:
https://github.com/joomla/com_jed4/tree/9f355541411dc22914e063057fad0008bd3a8b97/public_html/administrator/components/com_jed/layouts/joomla/toolbar

We need to create our own CSS to show the colors on the buttons.