feat: Dataset list improvements

Type of change

• Bug Fix
• Feature
• Pipeline
• Test
• Documentation

Does this introduce a change in the core logic?

• No
• Yes

Does this introduce a change in the cloud provider implementation, if so which cloud?

• AWS
• Anthos
• Azure
• GCP
• IBM

Does this follow conventional commits spec?

• No
• Yes

Have you set the target Milestone?

• No
• Yes

Have you set the no-detached-pipeline label?

• No
• Yes

Updates description?

Improvements and fixes for dataset retrieval from Cosmos DB:

• Updates the Sidecar implementation of dataset retrieval to return exactly the requested number of records from Cosmos DB, if available.
• Fix the utility/ls implementation to only return datasets in the root folder in specified path is '/'