Use std::optional if available. (#1627) #2026

Job	Run time
PSV.Linux.22.04.gcc9.Cpplint	8m 51s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 37s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 16s
PSV.MacOS15.Xcode16	3m 53s
PSV.iOS.MacOS15.Xcode16	7m 16s
PSV.MacOS13.Xcode15.x86_64	4m 8s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 17s
PSV.iOS.MacOS13.Xcode15	12m 42s
PSV.Linux.22.04.gcc11	8m 24s
PSV.iOS.MacOS14.Xcode15	7m 7s
PSV.iOS.MacOS13.Xcode14	14m 26s
PSV.Win.VC2022	10m 6s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 42s
PSV.Linux.22.04.clang	8m 38s
PSV.Linux.22.04.gcc13	8m 18s
PSV.MacOS14.Xcode15	3m 11s
PSV.Linux.Android.22.04	6m 4s
PSV.Clang.Format.Checker	33s
PSV.Commit.Checker	0s
	2h 2m 29s

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