Disable building of tests with build breaks (#88094)

Related to #87879

Author: jkotas

src/tests/JIT/jit64/jit64_3.csproj

@@ -1,10 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <ItemGroup>
-    <!-- Issue: https://github.com/dotnet/runtime/issues/87879 -->
-    <ProjectsToSkip Include="opt/rngchk/RngchkStress2_o.csproj" />
-    <ProjectsToSkip Include="opt/cse/hugeSimpleExpr1.csproj" />
-
-    <MergedWrapperProjectReference Include="opt/**/*.??proj" Exclude="@(ProjectsToSkip)" />
+    <MergedWrapperProjectReference Include="opt/**/*.??proj" />
   </ItemGroup>
 
   <Import Project="$(TestSourceDir)MergedTestRunner.targets" />

src/tests/JIT/jit64/opt/cse/hugeSimpleExpr1.csproj

@@ -4,6 +4,8 @@
     <RequiresProcessIsolation>true</RequiresProcessIsolation>
     <!-- Timeout on Arm64 -->
     <GCStressIncompatible>true</GCStressIncompatible>
+    <!-- Issue: https://github.com/dotnet/runtime/issues/87879 -->
+    <DisableProjectBuild>true</DisableProjectBuild>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>Full</DebugType>

src/tests/JIT/jit64/opt/rngchk/RngchkStress2_o.csproj

@@ -2,6 +2,8 @@
   <PropertyGroup>
     <DebugType>PdbOnly</DebugType>
     <Optimize>True</Optimize>
+    <!-- Issue: https://github.com/dotnet/runtime/issues/87879 -->
+    <DisableProjectBuild>true</DisableProjectBuild>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="RngchkStress2.cs" />