Fixes JointAction offsets not updated on reset

[renezurbruegg]

Description

Currently, when a user updates the default joint offsets in an environment, the corresponding fields in the JointAction terms are not updated.
This PR updates the joint offsets in the joint actions when the environment is reset.

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)

Screenshots

Checklist

• I have run the pre-commit checks with ./isaaclab.sh --format
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have updated the changelog and the corresponding version in the extension's config/extension.toml file
• I have added my name to the CONTRIBUTORS.md or my name already exists there

[renezurbruegg]

I assume this is not a very common use case, but was an issue for me. I change the default joint states on environment resets, leading to wrong actions.

[kellyguo11]

Thanks for the fix! Could you also add a quick update to the changelog and extension.toml versioning for the isaaclab extension?

[kellyguo11]

Just noticed a couple of unit tests are failing, looks like some shape mismatch issues with the offset.