chore: Add `From<&RunOpts>` for `ExecutorConfig` conversion (#11360)
## Summary
- Adds a `From<&RunOpts>` implementation for `ExecutorConfig` to bridge
turborepo-lib's options to the generic task executor
- This allows `turborepo-task-executor` to be configured from run
options without directly depending on turborepo-lib's internal types
## Testing
- `cargo check -p turborepo-lib` passes
- All existing tests continue to pass