Fix memory leak in QuadTreeIndex #2259

Job	Run time
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	4m 5s
PSV.Linux.latest.gcc14.Tests	16m 39s
PSV.Linux.22.04.gcc11.Tests	13m 34s
PSV.Linux.22.04.gcc9.Cpplint	10s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 48s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 4s
PSV.Linux.22.04.clang.Tests	14m 39s
PSV.iOS.MacOS15.Xcode26.ARM64	7m 59s
PSV.Linux.24.04.gcc13.Tests	13m 32s
PSV.Commit.Checker	6s
PSV.MacOS15.Xcode16.ARM64	6m 18s
PSV.Win.VC2022	9m 58s
PSV.iOS.MacOS15.Xcode16.ARM64	8m 8s
PSV.Clang.Format.Checker	34s
PSV.Linux.Android.22.04	9m 37s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 37s
PSV.iOS.MacOS14.Xcode15.ARM64	7m 38s
	2h 9m 26s

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