[CI] - add spot robot assets to CI test set

[aclegg3]

Motivation and Context

CI lab test is failing due to missing test asset required by changes in facebookresearch/habitat-lab#1543. Adding that asset appears to resolve the issue.

Thanks @ASzot for the suggested fix.

How Has This Been Tested

CI

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have completed my CLA (see CONTRIBUTING)
• I have added tests to cover my changes.
• All new and existing tests passed.

[jimmytyyang]

LGTM!