[BUILD] Fix if check on environment variable and add CMake variable #2207
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Fixes #2206
Changes
Fix the environment variable check, and also check if the same name (OPENTELEMETRY_EXTERNAL_COMPONENT_PATH) is defined as CMake variable. I'd prefer the cmake variable as it shows in the command line and help troubleshoot and create reproducible build, and env var is also taking effect in session global scope while CMake var is only for the CMake instance which is more restricted in scope.
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CHANGELOG.md
updated for non-trivial changes