Cleanup tests and switch to VPRetinaClusters

• Run tests in their own directory (see LHCb!3975 (merged))
• Switch reconstruction to use VPRetinaClusters

Alignment/Humboldt/scripts/gaudiupdate.py

@@ -91,7 +91,8 @@ myAlignIterator = AlignIterator(
     DELHCbPath="/world/BeforeMagnetRegion/VP:DetElement-Info-IOV"
     if UseDD4Hep else '/dd/Structure/LHCb',
     Elements=list(elements),
-    DerivativeFile='humb-vp-halves-modules-derivs',
+    DerivativeFile=os.path.join(
+        os.getenv("PREREQUISITE_0", ""), "humb-vp-halves-modules-derivs"),
     UpdateTool=myUpdateTool)
 
 control_flow = [myAlignIterator]