[BUILD] Fix protoc searching with non-imported protobuf::protoc target #8642

Job	Run time
Bazel noexcept	28m 3s
Bazel asan config	11m 17s
Bazel nortti	18m 45s
Bazel on MacOS	30m 53s
Bazel	19m 21s
Bazel with async export	20m 19s
Bazel tsan config	21m 33s
Bazel valgrind	23m 47s
Bazel with external abseil	28m 6s
Benchmark	13m 0s
CMake test (with abseil)	8m 22s
CMake clang 14 (maintainer mode, abiv2)	19m 32s
CMake clang 14 (maintainer mode, async)	17m 21s
CMake clang 14 (maintainer mode, sync)	25m 4s
CMake do not install test (with otlp-exporter)	25m 45s
CMake gcc 12 (maintainer mode, async)	10m 52s
CMake gcc 12 (maintainer mode, sync)	11m 16s
CMake install test (with abseil)	7m 23s
CMake test (with modern protobuf,grpc and abseil)	33m 17s
CMake msvc (maintainer mode)	11m 5s
CMake test (with opentracing-shim)	6m 35s
CMake test (build shared libraries with otlp-exporter and static gRPC)	29m 24s
CMake test (with otlp-exporter)	20m 41s
CMake test (without otlp-exporter)	6m 54s
CMake C++14 test(GCC)	8m 15s
CMake C++17 test(GCC)	7m 0s
CMake C++20 test(Clang with libc++)	11m 52s
CMake C++20 test(GCC)	12m 45s
CMake test (without otlp-exporter and with async export)	8m 54s
Code coverage	14m 25s
Copyright	8s
DocFX check	1m 24s
Format	21s
markdown-lint	7s
misspell	4s
Plugin -> CMake	1m 43s
CMake -> exporter proto	18m 2s
Bazel Windows	42m 16s
Plugin -> CMake Windows	9m 3s
CMake (With async export) -> exporter proto	17m 34s
CMake -> exporter proto (Build as DLL)	17m 19s
	10h 19m 47s

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