Automatically update asset-labels.md with ALLOWED_ASSET_LABELS_PER_TASK_RESULT

[GianlucaFicarelli]

Description

Update the script generate_asset_labels_table.py to generate a table in asset-labels.md also for ALLOWED_ASSET_LABELS_PER_TASK_RESULT as it was done for ALLOWED_ASSET_LABELS_PER_ENTITY

Acceptance criteria

• asset-labels.md is correctly updated with the assets in ALLOWED_ASSET_LABELS_PER_TASK_RESULT when the script is run