[SDK] Avoid missing conditional variable update and simplify atomic bool #9230

Job	Run time
Bazel asan config	14m 19s
Bazel noexcept	12m 3s
Bazel nortti	12m 7s
Bazel on MacOS	16m 3s
Bazel	13m 3s
Bazel with async export	12m 4s
Bazel tsan config	13m 43s
Bazel valgrind	13m 58s
Bazel with external abseil	12m 20s
Benchmark	7m 43s
CMake test (with abseil)	4m 34s
CMake clang 15 (maintainer mode, abiv2)	14m 8s
CMake clang 15 (maintainer mode, async)	14m 13s
CMake clang 15 (maintainer mode, sync)	14m 10s
CMake do not install test (with otlp-exporter)	14m 10s
CMake gcc 13 (maintainer mode, async)	6m 40s
CMake gcc 13 (maintainer mode, sync)	6m 28s
CMake install test (with abseil)	4m 13s
CMake test (with modern protobuf,grpc and abseil)	19m 3s
CMake msvc (maintainer mode)	1m 48s
CMake msvc (maintainer mode) with C++20	9m 7s
CMake test (with opentracing-shim)	4m 19s
CMake test (build shared libraries with otlp-exporter and static gRPC)	13m 35s
CMake test (with otlp-exporter)	14m 12s
CMake test (without otlp-exporter)	4m 32s
CMake C++14 test(GCC)	4m 2s
CMake C++17 test(GCC)	5m 14s
CMake C++20 test(Clang with libc++)	9m 53s
CMake C++20 test(GCC)	9m 33s
CMake C++23 test(Clang with libc++)	9m 23s
CMake C++23 test(GCC)	8m 29s
CMake test (without otlp-exporter and with async export)	7m 2s
Code coverage	11m 41s
Copyright	6s
DocFX check	53s
Format	19s
markdown-lint	12s
misspell	3s
Plugin -> CMake	45s
CMake -> exporter proto	12m 10s
Bazel Windows	23m 15s
Plugin -> CMake Windows	7m 3s
CMake (With async export) -> exporter proto	12m 54s
CMake -> exporter proto (Build as DLL)	25m 44s
	7h 1m 16s

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