docker: Use --gpus instead of nvidia runtime

[yanziz-nvidia]

Description

Use --gpus all instead of nvidia: runtime to prevent issues on unknown or invalid runtime name when running with docker or docker compose (python script).

Fixes #2390

Type of change

• Bug fix (non-breaking change which fixes an issue)
• This change requires a documentation update

Screenshots

N/A

Checklist

• [x] I have run the pre-commit checks with ./isaaclab.sh --format
• [x] I have made corresponding changes to the documentation
• [x] 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
• [x] I have added my name to the CONTRIBUTORS.md or my name already exists there