Expand central_freelist_fuzz and FakeStaticForwarder to exercise additional CentralFreeList paths and invariants: - #965
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…additional `CentralFreeList` paths and invariants: - Verify `GetSpanStats` consistency (`num_live_spans() == num_spans_requested - num_spans_returned`, `obj_capacity == num_live_spans() * objects_per_span`, `length() + live_objects == obj_capacity`) after every `InsertRange` and `RemoveRange`. - Exercise `ReleaseSpans` (`ReleaseToPageHeap` when `hooks_enabled` is true) and verify span release accounting. - Exercise `set_PrioritizeSpans` and `PrintSpanUtilStats` / `PrintSpanUtilStatsInPbtxt`. PiperOrigin-RevId: 982895325
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central_freelist_fuzzandFakeStaticForwarderto exercise additionalCentralFreeListpaths and invariants:GetSpanStatsconsistency (num_live_spans() == num_spans_requested - num_spans_returned,obj_capacity == num_live_spans() * objects_per_span,length() + live_objects == obj_capacity) after everyInsertRangeandRemoveRange.ReleaseSpans(ReleaseToPageHeapwhenhooks_enabledis true) and verify span release accounting.set_PrioritizeSpansandPrintSpanUtilStats/PrintSpanUtilStatsInPbtxt.