Fix CodSpeed: use CODSPEED_ANALYSIS not CODSPEED_SIMULATION

CodSpeed's CMake uses CODSPEED_ANALYSIS (not CODSPEED_SIMULATION) for
simulation mode. This define gates all the actual benchmark measurement
hooks in benchmark_runner.cpp and benchmark.h. Without it, benchmarks
run normally but CodSpeed doesn't detect them as instrumented.

script/cpp_benchmark.py

@@ -54,7 +54,7 @@ def run_benchmarks(selected_components: list[str], build_only: bool = False) ->
         project_root = Path(__file__).resolve().parent.parent
         codspeed_flags = [
             "-DCODSPEED_ENABLED",
-            "-DCODSPEED_SIMULATION",
+            "-DCODSPEED_ANALYSIS",
             f'-DCODSPEED_ROOT_DIR=\\"{project_root}\\"',
         ]
         pio_options = {