Implement apply() for cluster configuration changes

[ashleyvansp]

Overview

This pull request implements ApplyAsync() and its helper methods. The method is used to generate changes between the current state (the live Kusto cluster) and a desired state (YAML config file). It then executes those changes by running the change scripts on the Kusto cluster.

This PR is a follow-up to #106.

https://github.com/github/data/issues/9010

Changes

• Implements ApplyAsync() which diffs then executes cluster configuration changes
• Adds functionality to KustoClusterHandler to execute cluster scripts
• Refactors the KustoClusterHandler for better testability
• Updates the ClusterCapacityPolicy model to have parity with the model returned by .show cluster policy capacity
  • When I first created this model I was referencing the properties from the Microsoft docs, but the docs seem to be slightly out of sync with the actual model returned from Kusto

[Copilot]

Pull Request Overview

This PR adds the ability to diff and apply cluster configuration changes by implementing ApplyAsync() (and its helper WriteAsync/ExecuteClusterScriptAsync) in KustoClusterHandler and KustoClusterOrchestrator, refactors handlers to use ICslAdminProvider, and updates the capacity policy model to include MirroringCapacity.

• Introduces ApplyAsync in KustoClusterOrchestrator to load YAML, generate diffs, and execute scripts.
• Implements WriteAsync and ExecuteClusterScriptAsync in KustoClusterHandler to batch and run cluster scripts.
• Updates ClusterCapacityPolicy and related classes to add MirroringCapacity and refactor capacities.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Parser/YamlClusterHandlerFactory.cs	Implements IYamlClusterHandlerFactory
Parser/KustoClusterHandlerFactory.cs	Passes AdminClient to handler instead of full client
Parser/KustoClusterHandler.cs	Replaces KustoClient with ICslAdminProvider, adds script execution methods
Model/ClusterCapacityPolicy.cs	Adds MirroringCapacity, refactors materialized view capacity classes
KustoClusterOrchestrator.cs	Adds ApplyAsync for full apply workflow
Tests/Parser/KustoClusterHandlerTests.cs	Adds unit tests for WriteAsync and LoadAsync
Tests/KustoClusterOrchestratorTests.cs	Updates tests to use ICslAdminProvider mocks
Tests/Changes/ClusterChangesTest.cs	Refactors test helpers to match capacity policy changes

Comments suppressed due to low confidence (1)

KustoSchemaTools.Tests/KustoClusterOrchestratorTests.cs:6

• Essential using directives for Xunit ([Fact]), System.Threading.Tasks (async/Task), and System.Collections.Generic (List<>) were removed, causing compilation errors. Re-add these namespaces at the top of the test file.

using Kusto.Data.Common;