Update physics step update for some spatial functors

[yuecideng]

Description

This PR enhances the following things:

• add physics_update_step for randomize_rigid_object_pose functor
• update robot joint position setter for randomize_robot_eef_pose and randomize_robot_qpos

Type of change

• Enhancement (non-breaking change which improves an existing functionality)

Checklist

• I have run the black . command to format the code base.
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Dependencies have been updated, if applicable.

[Copilot]

Pull request overview

This PR updates gym launch configuration and spatial randomization functors to better control post-randomization physics stepping and to adjust how robot joint positions are applied during randomization.

Changes:

• Disable dataset saving automatically when --preview mode is enabled.
• Add an optional physics_update_step parameter to randomize_rigid_object_pose to apply physics steps after pose randomization.
• Update robot EEF/qpos randomization to set non-target qpos before setting target qpos, and reduce the subsequent physics update step count.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
embodichain/lab/gym/utils/gym_utils.py	Forces filter_dataset_saving=True when running in preview mode.
embodichain/lab/gym/envs/managers/randomization/spatial.py	Adds physics stepping option for rigid object pose randomization; adjusts robot qpos application and physics stepping after robot randomization.

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