[SDK] Support OTEL_SDK_DISABLED environment variable #11002

Job	Run time
CMake clang 18 (maintainer mode, abiv2)	10m 11s
CMake clang 18 (maintainer mode, async)	10m 22s
CMake clang 18 (maintainer mode, sync)	9m 45s
CMake gcc 14 (maintainer mode, async)	7m 45s
CMake gcc 14 (maintainer mode, sync)	10m 26s
CMake test (without otlp-exporter)	5m 54s
CMake test (with abseil)	5m 11s
CMake msvc (maintainer mode)	8m 9s
CMake msvc (maintainer mode) with C++20	10m 18s
CMake test (with opentracing-shim)	4m 39s
CMake C++14 test(GCC)	4m 45s
CMake C++17 test(GCC)	5m 8s
CMake C++20 test(Clang with libc++)	9m 33s
CMake C++20 test(GCC)	10m 3s
CMake test (without otlp-exporter and with async export)	6m 2s
Bazel without bzlmod	6h 0m 13s
Bazel	1m 5s
Bazel with async export	1m 24s
Bazel valgrind	6h 0m 15s
CMake do not install test (with otlp-exporter)	15m 17s
CMake install test (with abseil)	5m 32s
CMake test (with modern protobuf,grpc and abseil)	18m 3s
CMake test (build shared libraries with otlp-exporter and static gRPC)	15m 29s
CMake test (with otlp-exporter)	15m 40s
CMake C++23 test(Clang with libc++)	9m 31s
CMake C++23 test(GCC)	9m 53s
Plugin -> CMake	1m 11s
Bazel asan config	1m 4s
Bazel noexcept	1m 3s
Bazel nortti	52s
Bazel on MacOS	1m 22s
Bazel tsan config	59s
Benchmark	14m 11s
Copyright	7s
Format	26s
CMake -> exporter proto	13m 43s
Bazel Windows	13m 32s
CMake (With async export) -> exporter proto	14m 9s
CMake -> exporter proto (Build as DLL)	24m 32s
Code coverage	12m 53s
DocFX check	54s
markdown-lint	6s
misspell	4s
shellcheck	5s
W3C Distributed Tracing Validation V1	3m 59s
Plugin -> CMake Windows	8m 49s
	17h 24m 34s

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