Mark logs signal as stable API/SDK #8302

Job	Run time
Bazel asan config	31m 27s
Bazel noexcept	27m 16s
Bazel nortti	20m 47s
Bazel on MacOS	4m 19s
Bazel	23m 41s
Bazel tsan config	27m 35s
Bazel with async export	23m 35s
Bazel valgrind	23m 49s
Bazel with external abseil	22m 44s
Benchmark	14m 23s
CMake test (with abseil)	8m 40s
CMake clang 14 (maintainer mode, async)	20m 54s
CMake clang 14 (maintainer mode, sync)	21m 2s
CMake do not install test (with otlp-exporter)	29m 28s
CMake gcc 4.8 (with otlp exporter)	17m 35s
CMake gcc 4.8 (without otlp exporter)	5m 19s
CMake gcc 12 (maintainer mode, async)	16m 11s
CMake gcc 12 (maintainer mode, C++11, async)	20m 36s
CMake gcc 12 (maintainer mode, sync)	15m 35s
CMake msvc (maintainer mode)	11m 41s
CMake test (with opentracing-shim)	7m 52s
CMake test (build shared libraries with otlp-exporter and static gRPC)	21m 26s
CMake test (with otlp-exporter)	24m 28s
CMake test (without otlp-exporter)	6m 33s
CMake C++20 test(Clang with libc++)	10m 47s
CMake C++20 test(GCC)	12m 16s
CMake test (without otlp-exporter and with async export)	6m 27s
Code coverage	14m 1s
Copyright	7s
DocFX check	55s
Format	15s
markdown-lint	6s
misspell	7s
Plugin -> CMake	1m 29s
CMake -> exporter proto	18m 28s
Bazel Windows	35m 10s
CMake (With async export) -> exporter proto	17m 22s
Plugin -> CMake Windows	9m 16s
CMake -> exporter proto (Build as DLL)	18m 16s
	9h 51m 58s

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