TrialSpawnerConfig Registry

[Machine-Maker]

Is your feature request related to a problem?

Upstream's TrialSpawnerConfiguration is poorly designed and thought out. It should be a registry-related type that is immutable. The current design makes it impossible to store a registered config without serializing the whole thing to the trial spawner instead of just the reference key.

Describe the solution you'd like.

We should just deprecate that type and associated API for a new immutable type with registry entry builders for modification.

Describe alternatives you've considered.

N/A

Other

No response

[lynxplay]

Will also resolve #11026 once fixed.