[Open Data] Add tests to verify data

⚠️ Problem

We need tests to validate that the data in open datasets is good and free of bugs.

🛠️ Solution

Create tests to validate scenarios for each dataset:

• Regions: Each row with the same RegionId should have the same RegionName
  • Example hubs query:

    Regions 
    | summarize make_set(RegionName) by RegionId 
    | where array_length(set_RegionName) != 1
    

• Services: Each row with the same ServiceName should have the same ServiceCategory/Subcategory/etc
• Resource types: Do not include default portal links
• Resource types: Do not include "en-us" in any URLs

🙋‍♀️ Ask for the community

We could use your help:

1. Please vote this issue up (👍) to prioritize it.
2. Leave comments to help us solidify the vision.

Start with the Regions Kusto example and identify where open-dataset validation tests belong. Add checks for consistent region and service fields, non-default portal links, and URLs without "en-us"; done means each listed dataset scenario is covered by a passing test.