Switch static->sealed to use analyzer for FixAll

[viceroypenguin]

No description provided.

[Copilot]

Pull Request Overview

This PR converts the static-to-sealed handler refactoring from a code refactoring provider to a code fix provider, enabling "Fix All" functionality through analyzer integration.

Key changes:

• Converts StaticToSealedHandlerRefactoringProvider to StaticToSealedHandlerCodeFixProvider
• Adds new analyzer diagnostic IHR0019 for static handlers that could be sealed
• Updates test infrastructure to use code fix testing instead of refactoring testing

Reviewed Changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
StaticToSealedHandlerRefactoringProviderTests.cs	Renamed class and converted tests from refactoring to code fix testing
CodeRefactoringTestHelper.cs	Removed unused refactoring test helper
HandlerClassAnalyzer.cs	Added new diagnostic IHR0019 for static handlers that could be sealed
StaticToSealedHandlerCodeFixProvider.cs	Converted from refactoring provider to code fix provider with FixAll support
RefactoringExtensions.cs	Updated extension methods for code fix context
DiagnosticIds.cs	Added new diagnostic ID IHR0019
AnalyzerReleases.Shipped.md	Added release notes for new diagnostic
Multiple test files	Updated test expectations to include new IHR0019 diagnostic markers

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 53 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
....CodeFixes/StaticToSealedHandlerCodeFixProvider.cs	0.00%	34 Missing ⚠️
...mediate.Handlers.Analyzers/HandlerClassAnalyzer.cs	0.00%	19 Missing ⚠️

Files with missing lines	Coverage Δ
...mediate.Handlers.Analyzers/HandlerClassAnalyzer.cs	0.00% <0.00%> (ø)
....CodeFixes/StaticToSealedHandlerCodeFixProvider.cs	0.00% <0.00%> (ø)

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