Support transition timeout on all run targets

### What

Currently, the config schema allows users to configure a transition timeout for each run target. This value is not used internally and only the "Off" transition during shutdown has a (hardcoded) time limit.
As part of this, we should update the RunTarget structure to hold the loaded run target config, rather than discarding it after dependency graph construction.

### Acceptance Criteria (DoD)

- Transition timeout is accessible from RunTarget object
- If a transition timeout is configured for a run target and the time limit is exceeded, the transition fails
- A test should be added to verify this
- The max termination timeout introduced in #450 should be replaced with the off target's timeout

### How

_No response_