[EXPORTER] Fix forward protocol encoding for ETW exporter #8969

Job	Run time
CMake clang 14 (maintainer mode, sync)	13m 33s
CMake gcc 12 (maintainer mode, sync)	8m 2s
CMake test (with abseil)	5m 0s
CMake clang 14 (maintainer mode, abiv2)	18m 18s
CMake clang 14 (maintainer mode, async)	13m 59s
CMake gcc 12 (maintainer mode, async)	7m 55s
CMake msvc (maintainer mode)	11m 2s
CMake msvc (maintainer mode) with C++20	11m 56s
CMake test (with opentracing-shim)	5m 20s
CMake test (without otlp-exporter)	6m 35s
CMake C++14 test(GCC)	3m 54s
CMake C++17 test(GCC)	8m 58s
CMake C++20 test(GCC)	8m 20s
CMake test (without otlp-exporter and with async export)	4m 35s
Bazel asan config	14m 49s
Bazel noexcept	11m 39s
Bazel nortti	12m 3s
Bazel	12m 33s
Bazel with async export	15m 36s
Bazel valgrind	13m 59s
Bazel with external abseil	12m 47s
CMake do not install test (with otlp-exporter)	13m 36s
CMake install test (with abseil)	6m 40s
CMake test (with modern protobuf,grpc and abseil)	17m 57s
CMake test (build shared libraries with otlp-exporter and static gRPC)	17m 2s
CMake test (with otlp-exporter)	13m 40s
CMake C++20 test(Clang with libc++)	11m 47s
Plugin -> CMake	4m 43s
Bazel on MacOS	18m 18s
Bazel tsan config	12m 47s
Benchmark	7m 52s
Code coverage	11m 8s
Copyright	6s
DocFX check	1m 2s
Format	17s
markdown-lint	6s
misspell	3s
CMake -> exporter proto	15m 48s
Bazel Windows	23m 51s
Plugin -> CMake Windows	10m 3s
CMake (With async export) -> exporter proto	11m 55s
CMake -> exporter proto (Build as DLL)	12m 33s
	7h 12m 7s

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