gh-116760: Fix pystats for trace attempts (GH-116761)

There are now at least two bytecodes that may attempt to optimize,
JUMP_BACK, and more recently, COLD_EXIT.

Only the JUMP_BACK was counting the attempt in the stats.
This moves that counter to uop_optimize itself so it should
always happen no matter where it is called from.

Python/optimizer.c

@@ -1003,6 +1003,7 @@ uop_optimize(
     _PyBloomFilter dependencies;
     _Py_BloomFilter_Init(&dependencies);
     _PyUOpInstruction buffer[UOP_MAX_TRACE_LENGTH];
+    OPT_STAT_INC(attempts);
     int err = translate_bytecode_to_trace(frame, instr, buffer, UOP_MAX_TRACE_LENGTH, &dependencies);
     if (err <= 0) {
         // Error or nothing translated