Connection: User without permissions is prompted to connect

[mjangda]

Users without the jetpack_connect cap but the ability to manage modules are prompted to connect Jetpack.

Steps to reproduce the issue

• Start with a site that's not connected
• Add the following snippet to remove the jetpack_connect cap from all users:

add_filter( 'map_meta_cap', function( $caps, $cap, $user_id, $args ) {
    if ( 'jetpack_connect' === $cap ) {
        return [ 'do_not_allow' ];
    }
    return $caps;
}, 10, 4 );

• Go to the Jetpack page in the Dashboard
• The prompts to connect Jetpack should not be visible but they are.

Looks like we need to add a cap check here (https://github.com/Automattic/jetpack/blob/master/_inc/client/main.jsx#L167-L173) to make sure that the user has the connect permissions.