Make boost::optional as default regardless of C++ version. (#1631) #2032

Job	Run time
PSV.Linux.22.04.gcc9.Cpplint	8m 34s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 37s
PSV.Linux.22.04.gcc13	12m 19s
PSV.Linux.Android.22.04	6m 45s
PSV.iOS.MacOS13.Xcode15	12m 33s
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 18s
PSV.MacOS13.Xcode15.x86_64	4m 56s
PSV.Linux.22.04.gcc11	8m 14s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 24s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 38s
PSV.MacOS15.Xcode16	5m 58s
PSV.Linux.22.04.clang	8m 44s
PSV.iOS.MacOS15.Xcode16	6m 36s
PSV.iOS.MacOS13.Xcode14	13m 23s
PSV.Clang.Format.Checker	37s
PSV.iOS.MacOS14.Xcode15	6m 8s
PSV.Win.VC2022	10m 0s
PSV.MacOS14.Xcode15	5m 39s
PSV.Commit.Checker	0s
	2h 8m 23s

Provide feedback