refactor: migrate to slnx solution format

[vbreuss]

This PR migrates the solution from the traditional .sln format to the newer .slnx (XML-based) format, which is supported in modern versions of Visual Studio and .NET tooling. The migration also updates the build pipeline to target .NET 10.0 and upgrades Nuke build tools to version 10.1.0.

Key changes

• Replaced traditional Mockolate.sln file with new XML-based Mockolate.slnx format
• Updated build pipeline target framework from .NET 8.0 to .NET 10.0
• Updated Nuke build tool dependencies to version 10.1.0

[Copilot]

Pull request overview

This PR migrates the solution from the traditional .sln format to the newer .slnx (XML-based) format, which is supported in modern versions of Visual Studio and .NET tooling. The migration also updates the build pipeline to target .NET 10.0 and upgrades Nuke build tools to version 10.1.0.

Key changes:

• Replaced traditional Mockolate.sln file with new XML-based Mockolate.slnx format
• Updated build pipeline target framework from .NET 8.0 to .NET 10.0
• Updated Nuke build tool dependencies to version 10.1.0

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Pipeline/Build.csproj	Updated target framework from net8.0 to net10.0 for the build pipeline
Mockolate.slnx	New XML-based solution file replacing the traditional .sln format with organized folder structure
Mockolate.sln	Removed traditional Visual Studio solution file
Directory.Packages.props	Updated Nuke.Common and Nuke.Components package versions from 9.0.4 to 10.1.0
.nuke/parameters.json	Updated solution reference from Mockolate.sln to Mockolate.slnx

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% 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   5m 21s ⏱️ -35s
 1 792 tests ±0   1 791 ✅ ±0  1 💤 ±0  0 ❌ ±0 
11 973 runs  ±0  11 972 ✅ ±0  1 💤 ±0  0 ❌ ±0 

Results for commit af97441. ± Comparison against base commit 978a09c.

[github-actions]

🚀 Benchmark Results

Details

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

Intel Xeon Platinum 8370C CPU 2.80GHz (Max: 3.19GHz), 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-v4
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
Simple_Mockolate	1.555 μs	0.0062 μs	0.0055 μs	0.1488	-	3.66 KB
Simple_Moq	134.286 μs	0.7691 μs	0.7194 μs	0.4883	0.2441	14.56 KB
Simple_NSubstitute	5.822 μs	0.0634 μs	0.0562 μs	0.3662	-	9.14 KB
Simple_FakeItEasy	5.905 μs	0.0567 μs	0.0502 μs	0.3281	-	8.12 KB

[github-actions]

This is addressed in release v0.47.0.