Fix various analyzer errors

[glen-84]

Summary of the changes (Less than 80 chars)

• Fix various analyzer errors.

[Copilot]

Pull request overview

This PR focuses on resolving analyzer/compiler issues across the Mocha and HotChocolate codebases by cleaning up unused usings, aligning formatting, and modernizing C# syntax (type inference, collection expressions, method groups).

Changes:

• Simplify generic calls (e.g., SendAsync<T> → SendAsync) and DI registrations via type inference.
• Remove unused using directives and apply formatting tweaks/modern C# constructs (collection expressions, projection initializers).
• Minor refactors in runtime/builder code to satisfy formatting/analyzer rules.

Reviewed changes

Copilot reviewed 35 out of 35 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Mocha/test/Mocha.Mediator.Tests/NotificationStrategyTests.cs	Simplifies AddScoped registrations via type inference.
src/Mocha/test/Mocha.Mediator.Tests/NamedMediatorTests.cs	Removes explicit SendAsync<string> type arguments.
src/Mocha/test/Mocha.Mediator.Tests/MiddlewarePipelineTests.cs	Removes explicit SendAsync<string> type arguments; minor DI registration simplification.
src/Mocha/test/Mocha.Mediator.Tests/MiddlewareFactoryContextTests.cs	Refactors SendAsync<string> usage and adjusts middleware opt-out blocks; introduces nullability issue.
src/Mocha/test/Mocha.Mediator.Tests/ContextPoolingTests.cs	Removes explicit SendAsync<string> type arguments.
src/Mocha/test/Mocha.Mediator.Tests/AddHandlerTests.cs	Uses method group for Assert.Throws call.
src/Mocha/test/Mocha.Analyzers.Tests/TestHelper.cs	Removes unnecessary using; simplifies typeof(...) references for metadata references.
src/Mocha/test/Mocha.Analyzers.Tests/MessagingTestHelper.cs	Removes unused using Mocha.Analyzers;.
src/Mocha/src/Mocha/Builder/MessageBusBuilder.cs	Formatting changes; list initialization cleanup; adds #pragma to silence formatting analyzer in a ternary block.
src/Mocha/src/Mocha.Mediator/Pipeline/PipelineBuilder.cs	Removes unused using.
src/Mocha/src/Mocha.Mediator/DependencyInjection/MediatorServiceCollectionExtensions.cs	Uses generic type inference for TryAdd* registrations.
src/Mocha/src/Mocha.Mediator/DependencyInjection/MediatorHostBuilderExtensions.cs	Removes unused using.
src/Mocha/src/Mocha.Mediator.Abstractions/Unit.cs	XML doc cref simplified (System.Void → Void).
src/Mocha/src/Mocha.Analyzers/Utils/ImmutableEquatableArray.cs	Uses collection expression for empty immutable array creation.
src/Mocha/src/Mocha.Analyzers/MediatorGenerator.cs	Removes unused using.
src/Mocha/src/Mocha.Analyzers/KnownTypeSymbols.cs	Removes unused using.
src/Mocha/src/Mocha.Analyzers/Inspectors/NotificationHandlerInspector.cs	Removes unused using.
src/Mocha/src/Mocha.Analyzers/Inspectors/MultipleHandlerInterfaceInspector.cs	Removes unused using.
src/Mocha/src/Mocha.Analyzers/Inspectors/MessagingHandlerInspector.cs	Removes unused using.
src/Mocha/src/Mocha.Analyzers/Inspectors/MessageTypeInspector.cs	Removes unused using.
src/Mocha/src/Mocha.Analyzers/Inspectors/ISyntaxInspector.cs	Removes unused using.
src/Mocha/src/Mocha.Analyzers/Inspectors/HandlerInspector.cs	Removes unused using.
src/Mocha/src/Mocha.Analyzers/Inspectors/AbstractMessagingHandlerInspector.cs	Removes unused using.
src/Mocha/src/Mocha.Analyzers/Inspectors/AbstractHandlerInspector.cs	Removes unused using.
src/HotChocolate/Fusion/test/Fusion.Execution.Tests/Transport/Http/DefaultGraphQLHttpClientTests.cs	Replaces ImmutableArray.Create(...) with collection expressions; removes unused using.
src/HotChocolate/Fusion/test/Fusion.AspNetCore.Tests/CancellationTests.cs	Removes unused using.
src/HotChocolate/Fusion/src/Fusion.Execution/Execution/JsonVariableCoercion.cs	Removes unused using.
src/HotChocolate/Fusion/src/Fusion.Execution/DependencyInjection/HotChocolateFusionServiceCollectionExtensions.cs	Removes unused using.
src/HotChocolate/Fusion/src/Fusion.Diagnostics/FusionActivityEnricher.cs	Removes unused using.
src/HotChocolate/Diagnostics/src/Diagnostics/ActivityEnricher.cs	Removes unused using.
src/HotChocolate/AspNetCore/src/Transport.Http/GraphQLHttpResponse.cs	Removes unused using under conditional compilation.
src/HotChocolate/AspNetCore/src/Transport.Http/GraphQLHttpRequest.cs	Removes unused using under conditional compilation.
src/HotChocolate/AspNetCore/src/Transport.Http/GraphQLHttpClientExtensions.cs	Removes unused using under conditional compilation.
src/HotChocolate/AspNetCore/src/Transport.Http/DefaultGraphQLHttpClient.cs	Reorders/conditions usings; formatting fixes; small collection-expression spacing adjustment.
src/GreenDonut/test/GreenDonut.Data.EntityFramework.Tests/PagingHelperIntegrationTests.cs	Uses anonymous-type projection initializers (page.Value.Items) instead of explicit member name.

Comments suppressed due to low confidence (2)

src/Mocha/test/Mocha.Mediator.Tests/MiddlewareFactoryContextTests.cs:35

• capturedResponseType is inferred as non-nullable Type via var, but the middleware callback is Action<Type?> and later assertions expect it to become null. With nullable warnings treated as errors in this repo, assigning a Type? to Type will fail the build. Declare this as Type? (e.g., Type? capturedResponseType = typeof(object);) so the null assignment is valid.
  src/Mocha/test/Mocha.Mediator.Tests/MiddlewareFactoryContextTests.cs:73
• Same issue as above: capturedResponseType is inferred as non-nullable Type, but CaptureTypesMiddleware may assign null (Action<Type?>) and the test asserts Assert.Null(capturedResponseType). This will trigger nullable warnings (treated as errors). Use Type? here as well.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (b461ecb) to head (1a09edc).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #9474   +/-   ##
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