Collect metrics from matrix builds

Problem to solve

With #9788 (closed) we added a report type for metrics, but that was for a single job (as is the same model for other report types - SAST, Browser Performance, etc.)

However, given that the metrics format opens up the possibility for many different types of data to be collected, and that we'd like to allow for groups of metrics by type, it would make sense that different jobs across stages may all produce different metrics we'd like to track.

Intended users

Persona: DevOps Engineer and Persona: Development Team Lead

Further details

Proposal

• Allow many report: metrics artifacts to be created and uploaded during pipeline execution
• Concatenate those metrics into a single store of metrics for that pipeline
• Send all of the concatenated metrics to the Merge Request widget

Permissions and Security

This does not change the permission or security model for this feature.

Documentation

What does success look like, and how can we measure that?

What is the type of buyer?

Links / references

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