Add core benchmarks dir, fix core pseudo-component, use simulation mode

- Move scheduler/loop/helpers benchmarks to tests/benchmarks/components/core/
- Add random_float and random_uint32 benchmarks (from ol.yaml)
- Fix core pseudo-component crash: skip components where get_component()
  returns None when adding dependencies to config
- Use CodSpeed simulation mode (CPU instruction counting) for reproducible
  CI results instead of walltime

.github/workflows/ci.yml

@@ -339,6 +339,7 @@ jobs:
         with:
           run: ${{ steps.build.outputs.binary }}
           token: ${{ secrets.CODSPEED_TOKEN }}
+          mode: simulation
 
   clang-tidy-single:
     name: ${{ matrix.name }}