Address cmake issues requiring patches by the vcpkg port

[dbarker]

The community vcpkg port has several patches to opentelemetry-cpp cmake files:

1. Don't prefer the CONFIG search mode globally and remove the VCPKG_CHAINLOAD_TOOLCHAIN_FILE include
   • PR: [opentelemetry-cpp] Don't prefer CMake config microsoft/vcpkg#41742
   • Patch: https://github.com/microsoft/vcpkg/blob/master/ports/opentelemetry-cpp/cmake-quirks.diff
2. Support the OpenTracing static library target
   • PR: [opentelemetry-cpp] Fix fix microsoft/vcpkg#44037
   • Patch: https://github.com/microsoft/vcpkg/blob/master/ports/opentelemetry-cpp/fix-target_link.patch

These should be addressed so the patches can be removed.