📝 Description

Adds a HUB SDK for get_hub_item API that return HubItem object. This PR also fixes a bug in the get_hub_item HTTP client API path, along with adding related integration tests.

🛠️ Changes Made

• Introduce a new HUB SDK api get_hub_item under mlrun.hub
• Fix the get_hub_item API path: (f"hub/sources/{source_name}/items/{item_name}",) -> hub/sources/{source_name}/items/{item_name}

✅ Checklist

• I updated the documentation (if applicable)
• I have tested the changes in this PR
• I confirmed whether my changes are covered by system tests
  • If yes, I ran all relevant system tests and ensured they passed before submitting this PR
  • I updated existing system tests and/or added new ones if needed to cover my changes
• If I introduced a deprecation:
  • I followed the Deprecation Guidelines
  • I updated the relevant Jira ticket for documentation

🧪 Testing

• A new integration test test_get_hub_item was added to verify that the API works as expected.

🔗 References

• Ticket link: https://iguazio.atlassian.net/browse/ML-11865

🚨 Breaking Changes?

• Yes (explain below)
• No