Add a tests to check domain with port in network-requester allowed.list

[benedettadavico]

No description provided.

[jstuczyn]

For the context, the issue here is that our allow list doesn't correctly take ports into consideration, so:

#[tokio::test]
async fn test() {
    // this fails
    let mut filter = setup_with_allowed(&["4.2.2.2:53"]);
    assert!(filter.check("4.2.2.2:53").await);

    // this works (as expected)
    let mut filter = setup_with_allowed(&["4.2.2.2"]);
    assert!(filter.check("4.2.2.2:53").await);
}