[SDK] Support OTEL_SDK_DISABLED environment variable #11080

Job	Run time
CMake gcc 14 (maintainer mode, sync)	16m 29s
CMake test (with abseil)	5m 18s
CMake clang 18 (maintainer mode, abiv2)	18m 39s
CMake clang 18 (maintainer mode, async)	18m 32s
CMake clang 18 (maintainer mode, sync)	18m 27s
CMake gcc 14 (maintainer mode, async)	16m 24s
CMake msvc (maintainer mode)	9m 7s
CMake msvc (maintainer mode) with C++20	9m 10s
CMake test (with opentracing-shim)	4m 58s
CMake test (without otlp-exporter)	5m 50s
CMake C++14 test(GCC)	5m 1s
CMake test (without otlp-exporter and with async export)	5m 43s
Bazel	19m 18s
CMake do not install test (with otlp-exporter)	15m 25s
CMake install test (with abseil)	8m 33s
CMake test (with modern protobuf,grpc and abseil)	19m 23s
CMake test (build shared libraries with otlp-exporter and static gRPC)	14m 57s
CMake test (with otlp-exporter)	17m 8s
CMake C++17 test(GCC)	5m 25s
CMake C++20 test(Clang with libc++)	9m 50s
CMake C++20 test(GCC)	9m 50s
CMake C++23 test(Clang with libc++)	10m 14s
CMake C++23 test(GCC)	9m 34s
Plugin -> CMake	1m 56s
Bazel asan config	22m 21s
Bazel without bzlmod	16m 41s
Bazel nortti	18m 33s
Bazel noexcept	17m 10s
Bazel on MacOS	15m 1s
Bazel with async export	19m 50s
Bazel tsan config	18m 34s
Bazel valgrind	21m 56s
Benchmark	15m 14s
Copyright	6s
Format	1m 13s
CMake -> exporter proto	13m 13s
Code coverage	15m 25s
DocFX check	50s
markdown-lint	16s
misspell	7s
shellcheck	3s
Bazel Windows	39m 18s
Plugin -> CMake Windows	7m 20s
CMake (With async export) -> exporter proto	13m 34s
CMake -> exporter proto (Build as DLL)	24m 27s
W3C Distributed Tracing Validation V1	4m 8s
	9h 20m 31s

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