refactor: remove dead code in delegate source generation

[vbreuss]

This PR removes dead code related to delegate source generation and consolidates some test methods. The main focus is on cleaning up unused methods in the source generator and reorganizing test cases for better structure.

Key Changes

• Removed unused delegate-related source generation methods (AppendDelegateExtensions, AppendMockExtensions)
• Add missing source generation tests
• Eliminated unused helper method GetAllClasses() from MockClass
• Reorganized test methods by moving several tests to earlier positions in the test file

[Copilot]

Pull request overview

This PR removes dead code related to delegate source generation and consolidates some test methods. The main focus is on cleaning up unused methods in the source generator and reorganizing test cases for better structure.

Key Changes

• Removed unused delegate-related source generation methods (AppendDelegateExtensions, AppendMockExtensions)
• Eliminated unused helper method GetAllClasses() from MockClass
• Reorganized test methods by moving several tests to earlier positions in the test file

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Tests/Mockolate.SourceGenerators.Tests/Sources/MockClassTests.cs	Added test for special types support in mock generation
Tests/Mockolate.SourceGenerators.Tests/Sources/ForMockTests.ImplementClassTests.cs	Reorganized existing tests by moving them earlier in the file and added new tests for ref/out parameters and Span support
Source/Mockolate.SourceGenerators/Sources/Sources.ForMock.cs	Simplified XML documentation by removing iteration over additional implementations
Source/Mockolate.SourceGenerators/Sources/Sources.ForMock.CombinationExtensions.cs	Removed delegate extension generation methods and simplified the extension generation logic
Source/Mockolate.SourceGenerators/MockGenerator.cs	Updated method call to pass distinct additional implementations as parameter
Source/Mockolate.SourceGenerators/Entities/MockClass.cs	Removed unused GetAllClasses() helper method

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Test Results

    14 files  ±0      14 suites  ±0   4m 46s ⏱️ +26s
 1 673 tests +2   1 672 ✅ +2  1 💤 ±0  0 ❌ ±0 
11 168 runs  +6  11 167 ✅ +6  1 💤 ±0  0 ❌ ±0 

Results for commit d8fcb07. ± Comparison against base commit 84c7460.

[github-actions]

🚀 Benchmark Results

Details

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.3 LTS (Noble Numbat)

AMD EPYC 7763 2.60GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.101

[Host] : .NET 10.0.1 (10.0.1, 10.0.125.57005), X64 RyuJIT x86-64-v3
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
Simple_Mockolate	1.519 μs	0.0171 μs	0.0160 μs	0.2232	-	3.66 KB
Simple_Moq	178.970 μs	0.5043 μs	0.4211 μs	0.4883	-	14.55 KB
Simple_NSubstitute	6.049 μs	0.0143 μs	0.0119 μs	0.5569	0.0076	9.14 KB
Simple_FakeItEasy	6.768 μs	0.0173 μs	0.0162 μs	0.4959	-	8.11 KB

[github-actions]

This is addressed in release v0.45.0.