Optimize CreateModel + AlterModelManagers to CreateModel Description

Optimize CreateModel + AlterModelManagers to CreateModel Description: a task in Lego-RL-SWE-Bench-Verified (Harbor dataset). During migration optimization, CreateModel + AlterModelOptions is reduced to just CreateModel, with the model options. Similarly, CreateModel + AlterModelManagers can become…

The task

During migration optimization, CreateModel + AlterModelOptions is reduced to just CreateModel, with the model options. Similarly, CreateModel + AlterModelManagers can become just CreateModel.

Part of Lego-X/Lego-RL-SWE-Bench-Verified.