feat(node): Move tracing options to Http integration

[timfish]

Ref #5285 (comment)

Since both tracing and shouldCreateSpanForRequest effectively control whether tracing is enabled and have opposing defaults (tracing: false and shouldCreateSpanForRequest: _ => true), I have made tracing: TracingOptions | boolean so its not a breaking change and the options don't end up conflicting.

interface TracingOptions {
  tracePropagationTargets?: TracePropagationTargets;
  shouldCreateSpanForRequest?: (url: string) => boolean;
}

interface HttpOptions {
  breadcrumbs?: boolean;
  tracing?: TracingOptions | boolean;
}

The tests diff looks scary but all I did was duplicate the tracePropagationTargets and shouldCreateSpanForRequest tests to ensure they can be set via the constructor options.

[Lms24]

I like the change and to me it makes sense that we nest these two properties under the tracing options.