[EXPORTER] Fix forward protocol encoding for ETW exporter #8967

Job	Run time
CMake clang 14 (maintainer mode, abiv2)	13m 34s
CMake clang 14 (maintainer mode, async)	13m 39s
CMake gcc 12 (maintainer mode, async)	8m 0s
CMake gcc 12 (maintainer mode, sync)	7m 40s
CMake msvc (maintainer mode)	7m 45s
CMake msvc (maintainer mode) with C++20	8m 45s
CMake test (without otlp-exporter)	5m 4s
CMake test (with abseil)	4m 22s
CMake clang 14 (maintainer mode, sync)	14m 21s
CMake do not install test (with otlp-exporter)	14m 29s
CMake test (with modern protobuf,grpc and abseil)	17m 59s
CMake test (with opentracing-shim)	4m 20s
CMake test (with otlp-exporter)	13m 46s
CMake C++14 test(GCC)	4m 4s
CMake C++17 test(GCC)	4m 39s
CMake C++20 test(Clang with libc++)	9m 45s
CMake C++20 test(GCC)	8m 5s
CMake test (without otlp-exporter and with async export)	5m 18s
Bazel asan config	14m 41s
Bazel noexcept	11m 39s
Bazel nortti	11m 53s
Bazel on MacOS	21m 14s
Bazel	12m 25s
Bazel with async export	12m 25s
Bazel tsan config	13m 8s
Bazel valgrind	16m 19s
Bazel with external abseil	12m 32s
Benchmark	7m 49s
CMake install test (with abseil)	4m 51s
CMake test (build shared libraries with otlp-exporter and static gRPC)	13m 25s
Format	18s
Plugin -> CMake	47s
Code coverage	11m 21s
Copyright	5s
DocFX check	1m 1s
markdown-lint	10s
misspell	7s
CMake -> exporter proto	11m 29s
Bazel Windows	17m 43s
Plugin -> CMake Windows	6m 20s
CMake (With async export) -> exporter proto	12m 29s
CMake -> exporter proto (Build as DLL)	12m 10s
	6h 31m 56s

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