[SDK] Support OTEL_SDK_DISABLED environment variable #11075

Job	Run time
CMake clang 18 (maintainer mode, abiv2)	18m 31s
CMake clang 18 (maintainer mode, async)	20m 10s
CMake gcc 14 (maintainer mode, async)	16m 10s
CMake gcc 14 (maintainer mode, sync)	16m 3s
CMake test (without otlp-exporter)	5m 56s
CMake test (with abseil)	5m 16s
CMake clang 18 (maintainer mode, sync)	18m 25s
CMake msvc (maintainer mode)	8m 41s
CMake msvc (maintainer mode) with C++20	9m 0s
CMake test (with opentracing-shim)	4m 19s
CMake C++14 test(GCC)	4m 45s
CMake C++17 test(GCC)	5m 47s
CMake C++20 test(Clang with libc++)	10m 2s
CMake C++20 test(GCC)	10m 32s
CMake C++23 test(Clang with libc++)	10m 4s
CMake C++23 test(GCC)	9m 53s
CMake test (without otlp-exporter and with async export)	5m 53s
Bazel without bzlmod	16m 36s
Bazel noexcept	17m 54s
Bazel nortti	18m 10s
Bazel on MacOS	11m 34s
Bazel	18m 32s
Bazel with async export	18m 49s
Bazel tsan config	18m 22s
Bazel valgrind	21m 47s
CMake do not install test (with otlp-exporter)	15m 21s
CMake install test (with abseil)	5m 46s
CMake test (with modern protobuf,grpc and abseil)	17m 53s
CMake test (with otlp-exporter)	16m 54s
CMake test (build shared libraries with otlp-exporter and static gRPC)	15m 43s
Plugin -> CMake	1m 23s
Bazel asan config	21m 35s
Benchmark	14m 39s
Code coverage	12m 58s
Copyright	7s
DocFX check	57s
Format	26s
markdown-lint	7s
misspell	4s
shellcheck	5s
W3C Distributed Tracing Validation V1	4m 7s
CMake -> exporter proto	13m 57s
Bazel Windows	36m 10s
Plugin -> CMake Windows	8m 18s
CMake (With async export) -> exporter proto	13m 35s
CMake -> exporter proto (Build as DLL)	34m 54s
	9h 16m 10s

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