fix: disable failing mutation tests

[vbreuss]

This PR temporarily disables mutation tests by adding a configuration flag and applying conditional execution logic. The change allows the build pipeline to skip mutation testing until stryker-mutator/stryker-net#3327 is resolved.

Key changes

• Added a DisableMutationTests boolean flag set to true
• Applied conditional execution to MutationTests and MutationTestDashboard targets using the new flag

[Copilot]

Pull Request Overview

This PR temporarily disables mutation tests to work around a known issue in Stryker.NET (issue #3327) by introducing a configuration flag that conditionally skips mutation test execution.

Key changes:

• Introduces a DisableMutationTests flag set to true to control mutation test execution
• Applies conditional execution logic to all mutation test targets using the new flag

[github-actions]

🚀 Benchmark Results

Details

BenchmarkDotNet v0.15.6, Linux Ubuntu 24.04.3 LTS (Noble Numbat)

AMD EPYC 7763 2.69GHz, 1 CPU, 4 logical and 2 physical cores

.NET SDK 10.0.100

[Host] : .NET 8.0.22 (8.0.22, 8.0.2225.52707), X64 RyuJIT x86-64-v3
Job=InProcess  Toolchain=InProcessEmitToolchain  IterationCount=15

LaunchCount=1  WarmupCount=10

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
Bool_aweXpect	276.6 ns	2.31 ns	2.05 ns	0.0424	-	712 B
Bool_FluentAssertions	251.9 ns	4.65 ns	4.35 ns	0.0567	-	952 B
Equivalency_aweXpect	307,948.8 ns	871.60 ns	680.48 ns	20.0195	0.4883	335452 B
Equivalency_FluentAssertions	2,700,299.7 ns	51,870.43 ns	48,519.63 ns	285.1563	46.8750	4804906 B
Int_GreaterThan_aweXpect	258.0 ns	1.96 ns	1.64 ns	0.0486	-	816 B
Int_GreaterThan_FluentAssertions	247.4 ns	2.16 ns	2.02 ns	0.0730	-	1224 B
ItemsCount_AtLeast_aweXpect	495.1 ns	2.63 ns	2.33 ns	0.0811	-	1368 B
ItemsCount_AtLeast_FluentAssertions	471.1 ns	5.39 ns	4.50 ns	0.1197	-	2008 B
String_aweXpect	468.8 ns	2.41 ns	2.26 ns	0.0677	-	1136 B
String_FluentAssertions	1,299.1 ns	11.61 ns	10.86 ns	0.2346	-	3944 B
StringArray_aweXpect	1,948.1 ns	20.64 ns	19.31 ns	0.1564	-	2632 B
StringArray_FluentAssertions	1,332.3 ns	7.45 ns	6.97 ns	0.2480	-	4152 B
StringArrayInAnyOrder_aweXpect	2,490.3 ns	12.87 ns	12.03 ns	0.1678	-	2824 B
StringArrayInAnyOrder_FluentAssertions	89,613.1 ns	419.28 ns	350.12 ns	3.4180	-	58598 B

[github-actions]

This is addressed in release v2.29.0.