[opentelemetry-collector] Add extension validation for health_check #1070
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This PR adds a validation check to ensue that
health_check
extension is always included in theextensions
list.This will ensure that users who manually define extensions will always add the
health_check
one as well as described at open-telemetry/opentelemetry-collector-contrib#29558 (comment).Without the
health_check
extension the collector would be failing.Fixes #974.