fix(ext/http): Add port number only when the host is not defined

[Sanskar531]

Fixes issue from #18154

[jerry4718]

During my testing of node:http, I found that its original implementation was that opts.hostname should have a higher priority than opts.host.

In addition, if opts.hostname is not specified and :port is included in opts.host, there will also be a throw error in node.js, so we only need to adjust the priority of the host value.

[aapoalas]

I'm somewhat worried that we might be causing another bug to appear with this change regarding host configurations that do not define a port. That kind of configuration is probably incorrect as it should use hostname in that case but we should check if that still works in Node or not.

[aapoalas]

question: Is it possible, and does Node work with a configuration where host and port are both set and the host does not define a port? ie. Should we check for : presence in opts.host here?