Show information about Cloud Runtime in Highlight Items

### Problem Statement

The event can include a cloud platform (`event.contexts.cloud_resource['cloud.provider']`). This can be e.g. `cloudflare` or `vercel`.

For backend events, this could be shown in the highlights icon summary.

### Solution Brainstorm

_No response_

### Product Area

Issues

Start by tracing how backend events produce the highlights icon summary and where event.contexts.cloud_resource is read. Check how the cloud.provider value is represented for providers such as Cloudflare or Vercel. Done means the cloud runtime is shown in highlight summaries for backend events without changing unrelated event types.

Written by the indexing model from the issue text.