[SDK] Avoid missing conditional variable update and simplify atomic bool #9285

Job	Run time
Bazel nortti	12m 36s
Bazel asan config	14m 43s
Bazel noexcept	11m 42s
Bazel on MacOS	16m 13s
Bazel	12m 20s
Bazel with async export	12m 21s
Bazel tsan config	12m 50s
Bazel valgrind	13m 55s
Bazel with external abseil	12m 37s
Benchmark	8m 9s
CMake test (with abseil)	4m 34s
CMake clang 15 (maintainer mode, abiv2)	13m 41s
CMake clang 15 (maintainer mode, async)	14m 16s
CMake do not install test (with otlp-exporter)	13m 37s
CMake gcc 13 (maintainer mode, async)	6m 38s
CMake clang 15 (maintainer mode, sync)	14m 9s
CMake gcc 13 (maintainer mode, sync)	6m 55s
CMake install test (with abseil)	4m 18s
CMake test (with modern protobuf,grpc and abseil)	18m 16s
CMake msvc (maintainer mode)	7m 17s
CMake msvc (maintainer mode) with C++20	8m 4s
CMake test (with opentracing-shim)	4m 23s
CMake test (build shared libraries with otlp-exporter and static gRPC)	13m 51s
CMake test (with otlp-exporter)	13m 41s
CMake test (without otlp-exporter)	5m 8s
CMake C++14 test(GCC)	4m 16s
CMake C++20 test(Clang with libc++)	9m 30s
CMake C++17 test(GCC)	4m 39s
CMake C++20 test(GCC)	8m 24s
CMake C++23 test(Clang with libc++)	9m 41s
CMake C++23 test(GCC)	8m 56s
CMake test (without otlp-exporter and with async export)	4m 54s
Code coverage	11m 23s
Copyright	5s
DocFX check	47s
Format	16s
markdown-lint	7s
misspell	4s
Plugin -> CMake	1m 8s
CMake -> exporter proto	12m 6s
Bazel Windows	20m 5s
Plugin -> CMake Windows	6m 37s
CMake (With async export) -> exporter proto	12m 38s
CMake -> exporter proto (Build as DLL)	27m 34s
	6h 59m 24s

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