Test batching

[NickSdot]

Description

Self-reminder to follow up on test batching improvements: round robin or duration based sharding

Ref: #22939 (comment), #22952 (review)

[arnaud-lb]

As mentioned in #22952 (review) we should also try to forward redirect tests to the control process instead of running them all in the same worker.

[NickSdot]

As mentioned in #22952 (review) we should also try to forward redirect tests to the control process instead of running them all in the same worker.

Yups, noted, was already in my refs in the desc. 🫡