Fix scroll jump when selecting items at the bottom of the benchmark regions list (#2055)

Fixes OPS-3835.

Author: cezudas

packages/react-ui/src/app/features/benchmark/components/benchmark-wizard.tsx

@@ -158,7 +158,7 @@ export const BenchmarkWizard = ({
                   <DynamicBenchmarkStep
                     stepResponse={currentStepResponse}
                     value={currentSelections}
-                    stepBodyClassName="flex-1 min-h-0 overflow-y-auto"
+                    stepBodyClassName="relative flex-1 min-h-0 overflow-y-auto"
                     onValueChange={setCurrentSelections}
                   />
                 )}