Implement aria-label for dropdown button and update UI tests

[amisskii]

Is your enhancement related to a problem? Please describe

With the recent UI changes from a combo box to a button for the provider type menu, our e2e tests that use the Kind cluster are broken.

Describe the solution you'd like

• Update the locator to use the new button.
• Assign the proper aria-label to this button.
• Modify our UI tests to verify the accessibility of the button using its aria-label. https://github.com/containers/podman-desktop/pull/9520#discussion_r1810367941

Describe alternatives you've considered

No response

Additional context

Related to: https://github.com/containers/podman-desktop/issues/9522