[SDK] Avoid missing conditional variable update and simplify atomic bool #9322

Job	Run time
Bazel asan config	35m 24s
Bazel noexcept	11m 42s
Bazel nortti	11m 41s
Bazel on MacOS	14m 34s
Bazel	12m 12s
Bazel with async export	12m 7s
Bazel tsan config	12m 5s
Bazel valgrind	13m 52s
Bazel with external abseil	12m 25s
Benchmark	8m 22s
CMake test (with abseil)	4m 24s
CMake clang 15 (maintainer mode, abiv2)	14m 3s
CMake clang 15 (maintainer mode, async)	14m 18s
CMake clang 15 (maintainer mode, sync)	14m 8s
CMake do not install test (with otlp-exporter)	14m 8s
CMake gcc 13 (maintainer mode, async)	6m 45s
CMake gcc 13 (maintainer mode, sync)	6m 49s
CMake install test (with abseil)	4m 22s
CMake test (with modern protobuf,grpc and abseil)	19m 10s
CMake msvc (maintainer mode) with C++20	9m 1s
CMake msvc (maintainer mode)	7m 56s
CMake test (with opentracing-shim)	4m 10s
CMake test (build shared libraries with otlp-exporter and static gRPC)	13m 33s
CMake test (with otlp-exporter)	14m 12s
CMake test (without otlp-exporter)	4m 47s
CMake C++14 test(GCC)	4m 11s
CMake C++20 test(Clang with libc++)	9m 26s
CMake C++17 test(GCC)	4m 55s
CMake C++20 test(GCC)	8m 45s
CMake C++23 test(Clang with libc++)	9m 20s
CMake C++23 test(GCC)	8m 55s
CMake test (without otlp-exporter and with async export)	4m 43s
Code coverage	11m 21s
Copyright	7s
DocFX check	37s
Format	13s
markdown-lint	12s
misspell	4s
Plugin -> CMake	57s
CMake -> exporter proto	13m 1s
Bazel Windows	23m 3s
Plugin -> CMake Windows	7m 5s
CMake (With async export) -> exporter proto	12m 37s
CMake -> exporter proto (Build as DLL)	25m 10s
	7h 20m 52s

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