ref(core): Move shouldPropagateTraceForUrl from opentelemetry to core

[github-actions]

Note

The pull request "ref(core): Move shouldPropagateTraceForUrl from opentelemetry to core" was created by @andreiborza but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.

This PR adds outgoing trace propagation for http requests to node-core/light.

For that we ended up renaming the integration to httpIntegration (from httpServerIntegration). We haven't node-core/light yet so it's not a breaking change.

We also extract shared HTTP request utils (header injection, breadcrumbs, URL construction) into a helper to reduce duplication between light mode and node-core.

Based on: #19254

[linear]

JS-1677