[release] Bump EnvPool assets to 0.3.0

[Trinkle23897]

Description

This bumps EnvPool to 1.2.5 and updates release asset resolution for the published envpool-assets==0.3.0 split packages:

• envpool-assets
• envpool-assets-mujoco-large
• envpool-assets-mujoco-playground-humanoid

The registration modules now resolve assets from the owning split asset package, while keeping the existing local-package / ENVPOOL_ASSETS_PATH fallback path. The release smoke check also verifies representative files from each split asset wheel.

Motivation and Context

This fixes missing MuJoCo Playground assets in the 1.2.4 release path, where installed wheels could register Playground envs but fail at runtime because the XML assets were not present in envpool-assets.

Fixes #413.

• I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds core functionality)
• New environment (non-breaking change which adds 3rd-party environment)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)
• Example (update in the folder of example)

Implemented Tasks

• Bump EnvPool version to 1.2.5 and require asset wheels >=0.3.0,<0.4.0
• Route base, MyoSuite, and MuJoCo Playground registrations to the correct split asset packages
• Extend release smoke checks to cover the split asset packages and a Playground env

Checklist

Go over all the following points, and put an x in all the boxes that apply.
If you are unsure about any of these, don't hesitate to ask. We are here to help!

• I have read the CONTRIBUTION guide (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.
• I have reformatted the code using make format (required)
• I have checked the code using make lint (required)
• I have ensured make bazel-test pass. (required)

Validation run:

• python3 -m py_compile envpool/registration.py envpool/atari/registration.py envpool/gfootball/registration.py envpool/procgen/registration.py envpool/vizdoom/registration.py envpool/mujoco/dmc/registration.py envpool/mujoco/gym/registration.py envpool/mujoco/metaworld/registration.py envpool/mujoco/myosuite/registration.py envpool/mujoco/playground/registration.py envpool/mujoco/robotics/registration.py scripts/release_installed_wheel_smoke.py
• git diff --check origin/main...HEAD
• envpool-assets GitHub Actions run 26133010572 built and published all three 0.3.0 asset wheels successfully

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