Fix race conditions in TaskContext and CancellationContext cancellation #2285

Job	Run time
PSV.Linux.22.04.clang.Tests	11m 5s
PSV.Linux.22.04.gcc9.Tests.CodeCov	8m 59s
PSV.Linux.latest.gcc14.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	4m 19s
PSV.Linux.22.04.gcc11.Tests	12m 14s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 5s
PSV.Linux.Android.22.04	5m 51s
PSV.Linux.latest.gcc14.Tests	14m 44s
PSV.Win.VC2022	9m 56s
PSV.iOS.MacOS14.Xcode15.ARM64	6m 52s
PSV.Linux.22.04.gcc9.Cpplint	10s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 44s
PSV.Linux.24.04.gcc13.Tests	11m 53s
PSV.Clang.Format.Checker	44s
PSV.MacOS15.Xcode16.ARM64	6m 51s
PSV.iOS.MacOS15.Xcode16.ARM64	7m 47s
PSV.iOS.MacOS15.Xcode26.ARM64	6m 41s
PSV.Commit.Checker	9s
	1h 54m 4s

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