Mark logs signal as stable API/SDK #8301

Job	Run time
Bazel asan config	25m 43s
Bazel noexcept	18m 47s
Bazel nortti	18m 27s
Bazel on MacOS	4m 27s
Bazel	25m 19s
Bazel with async export	24m 3s
Bazel tsan config	26m 29s
Bazel valgrind	23m 29s
Bazel with external abseil	22m 24s
Benchmark	11m 42s
CMake test (with abseil)	8m 22s
CMake clang 14 (maintainer mode, async)	20m 48s
CMake clang 14 (maintainer mode, sync)	20m 59s
CMake do not install test (with otlp-exporter)	19m 47s
CMake gcc 4.8 (with otlp exporter)	14m 36s
CMake gcc 4.8 (without otlp exporter)	5m 49s
CMake gcc 12 (maintainer mode, async)	15m 33s
CMake gcc 12 (maintainer mode, C++11, async)	18m 12s
CMake gcc 12 (maintainer mode, sync)	18m 52s
CMake msvc (maintainer mode)	12m 31s
CMake test (with opentracing-shim)	5m 58s
CMake test (build shared libraries with otlp-exporter and static gRPC)	23m 0s
CMake test (with otlp-exporter)	25m 57s
CMake test (without otlp-exporter)	6m 44s
CMake C++20 test(Clang with libc++)	11m 40s
CMake C++20 test(GCC)	17m 10s
CMake test (without otlp-exporter and with async export)	6m 17s
Code coverage	17m 36s
Copyright	9s
DocFX check	48s
Format	20s
markdown-lint	10s
misspell	4s
Plugin -> CMake	1m 22s
CMake -> exporter proto	17m 20s
Bazel Windows	38m 16s
Plugin -> CMake Windows	12m 7s
CMake (With async export) -> exporter proto	24m 3s
CMake -> exporter proto (Build as DLL)	16m 18s
	9h 41m 38s

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