Exclude Validation test projects from CI Test target

Validation (Reqnroll/BDD) projects require a running server instance
and are not suitable for CI unit test runs. Exclude *.Validation
alongside *.IntegrationTests.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: sharpninja

GitVersion.yml

@@ -1,5 +1,5 @@
 mode: ContinuousDelivery
-next-version: 0.2.88
+next-version: 0.2.90
 assembly-versioning-scheme: MajorMinorPatch
 assembly-informational-format: '{SemVer}+Branch.{BranchName}.Sha.{ShortSha}'
 branches:

build/Build.Test.cs

@@ -12,7 +12,8 @@ partial class Build
         {
             var testProjects = Solution.GetAllProjects("*")
                 .Where(p => p.Name.EndsWith(".Tests") || p.Name.EndsWith(".Validation"))
-                .Where(p => !p.Name.Contains("IntegrationTests"));
+                .Where(p => !p.Name.Contains("IntegrationTests"))
+                .Where(p => !p.Name.EndsWith(".Validation"));
 
             foreach (var project in testProjects)
             {