fix(build): remove uncommitted Integration.Tests from slnx

The project files aren't tracked yet, causing CI to fail.

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

Author: iammukeshm

src/FSH.Framework.slnx

@@ -43,7 +43,6 @@
     <Project Path="Tests/Generic.Tests/Generic.Tests.csproj" />
     <Project Path="Tests/Identity.Tests/Identity.Tests.csproj" />
     <Project Path="Tests/Multitenancy.Tests/Multitenancy.Tests.csproj" Id="985345a2-edb4-4ef9-9a1b-59b704f523b6" />
-    <Project Path="Tests/Integration.Tests/Integration.Tests.csproj" />
   </Folder>
   <Folder Name="/Tools/">
     <Project Path="Tools/CLI/FSH.CLI.csproj" />