[BUILD] Accept path list in OPENTELEMETRY_EXTERNAL_COMPONENT_PATH #8865

Job	Run time
CMake clang 14 (maintainer mode, sync)	13m 28s
CMake test (with abseil)	4m 25s
CMake clang 14 (maintainer mode, abiv2)	14m 22s
CMake clang 14 (maintainer mode, async)	14m 1s
CMake gcc 12 (maintainer mode, async)	7m 57s
CMake msvc (maintainer mode)	7m 44s
CMake gcc 12 (maintainer mode, sync)	7m 55s
CMake test (with opentracing-shim)	4m 10s
CMake test (without otlp-exporter)	4m 56s
CMake test (without otlp-exporter and with async export)	4m 52s
Bazel	12m 23s
Bazel with async export	13m 4s
Bazel with external abseil	12m 46s
CMake do not install test (with otlp-exporter)	13m 38s
CMake install test (with abseil)	4m 32s
CMake test (with modern protobuf,grpc and abseil)	18m 24s
CMake test (build shared libraries with otlp-exporter and static gRPC)	13m 25s
CMake test (with otlp-exporter)	14m 4s
CMake C++14 test(GCC)	4m 17s
CMake C++17 test(GCC)	4m 49s
CMake C++20 test(Clang with libc++)	9m 9s
CMake C++20 test(GCC)	8m 30s
Plugin -> CMake	54s
Bazel asan config	14m 57s
Bazel noexcept	11m 41s
Bazel nortti	12m 49s
Bazel on MacOS	29m 29s
Bazel tsan config	13m 3s
Bazel valgrind	14m 5s
Benchmark	7m 56s
Copyright	6s
Format	14s
CMake -> exporter proto	12m 27s
Bazel Windows	21m 24s
Plugin -> CMake Windows	6m 32s
CMake (With async export) -> exporter proto	12m 34s
CMake -> exporter proto (Build as DLL)	12m 45s
Code coverage	11m 17s
DocFX check	1m 0s
markdown-lint	7s
misspell	5s
	6h 36m 16s

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