Move measurement to import service layer

What does this MR do?

This MR will push the measurements down from the rake layer to the import service layer (where the actual import logic executes).

This means we'd be able to take measurements via our performance CI pipeline, which is currently based on API integration, not rake tasks. Since we will use a structured JSON log instead of logging plain text to stdout, these logs could be indexed by Kibana...

Related to: #213100 (closed)

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content