iOS tests sometimes fail to start due to some "server disconnect" issue on BS side.
This seems more prominent on certain devices (e.g. iPhone 16 with iOS 18).
So, we also change the 'iOS latest' target to a more stable one.
To have tests work Browserstack Safari (also below iOS 15), as the tests are run in an iframe,
rewriting localhost as hostname, making WebCrypto not available.
We keep HTTP for the non-browserstack tests so that in local testing,
generating self-signed certs is not required.
