[EXPORTER] Fix forward protocol encoding for ETW exporter #8968

Job	Run time
CMake clang 14 (maintainer mode, abiv2)	13m 54s
CMake clang 14 (maintainer mode, async)	13m 35s
CMake clang 14 (maintainer mode, sync)	13m 44s
CMake gcc 12 (maintainer mode, sync)	7m 45s
CMake gcc 12 (maintainer mode, async)	8m 4s
CMake msvc (maintainer mode)	6m 44s
CMake msvc (maintainer mode) with C++20	8m 17s
CMake test (without otlp-exporter)	4m 57s
CMake test (with abseil)	4m 44s
CMake do not install test (with otlp-exporter)	13m 50s
CMake install test (with abseil)	4m 30s
CMake test (with modern protobuf,grpc and abseil)	18m 27s
CMake test (with opentracing-shim)	4m 19s
CMake test (build shared libraries with otlp-exporter and static gRPC)	14m 20s
CMake test (with otlp-exporter)	13m 27s
CMake C++14 test(GCC)	4m 4s
CMake C++17 test(GCC)	4m 49s
CMake C++20 test(Clang with libc++)	9m 9s
CMake C++20 test(GCC)	8m 46s
CMake test (without otlp-exporter and with async export)	4m 48s
Bazel asan config	14m 55s
Bazel noexcept	11m 45s
Bazel nortti	12m 5s
Bazel on MacOS	24m 45s
Bazel	12m 17s
Bazel with async export	12m 0s
Bazel tsan config	13m 46s
Bazel valgrind	14m 9s
Bazel with external abseil	12m 47s
Benchmark	7m 59s
Copyright	4s
Format	11s
Plugin -> CMake	53s
CMake -> exporter proto	9m 57s
Bazel Windows	11m 22s
Plugin -> CMake Windows	6m 17s
CMake (With async export) -> exporter proto	9m 41s
CMake -> exporter proto (Build as DLL)	9m 39s
Code coverage	11m 19s
DocFX check	1m 0s
misspell	5s
markdown-lint	7s
	6h 19m 16s

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