support fabric eventhouse

[yaananth]

Fabric eventhouse is just a kusto engine under the hood.

The changes here allows schematools to work with fabric eventhouse as well

[Copilot]

Pull Request Overview

This PR adds support for Microsoft Fabric Eventhouse by extending the ToKustoClusterUrl method to handle Fabric cluster URLs with the .fabric.microsoft.com domain pattern.

• Enhanced URL handling logic to detect and properly format Fabric cluster URLs
• Improved null/empty string handling with explicit guard clauses
• Added comprehensive test coverage for both traditional Kusto and new Fabric URL patterns

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
KustoSchemaTools/Parser/KustoExtensions.cs	Updated ToKustoClusterUrl method to support Fabric URLs and improved input validation
KustoSchemaTools.Tests/Parser/KustoExtensionsTests.cs	Added comprehensive test cases covering Fabric URLs and edge cases

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}