`HttpBindingsMissingValidator` skips validating services when no http trait is yet applied

[timocov]

If you have the model where no operations have @http trait yet (e.g. when you're onboarding a new service), the validator doesn't report errors. For example, if you have a model:

$version: "2"

namespace test

use aws.protocols#restJson1

@restJson1
service TestService {
    operations: [
        Op
        HttpOp
    ]
}

operation Op {}

//@http(method: "GET", uri: "/test")
operation HttpOp {}

and you run smithyBuild you won't get any errors reported. But once you uncomment @http line you will get an error for operation Op.

It looks like this was like that from the beginning because of this check.

[kstich]

Reopening to give model authors more time to adjust to this.