Add RCA daily run staging partitions

What does this merge request do and why?

This MR creates multiple RCA daily run partitions on staging to get around GraphQL request limit (issue).

• 5 partitions, each contain 1,000 tests. This covers the full 4,895 tests on root_cause_analysis.error_trace_v4
• Each partition will be assigned a service account token, configured via schedule pipelines.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Merge request checklist

• I've ran the affected pipeline(s) to validate that nothing is broken.
• Tests added for new functionality. If not, please raise an issue to follow up.
• Documentation added/updated, if needed.