pkg/observability/opentelemetry.go does not have unit test

[phuhung273]

Describe the feature
pkg/observability/opentelemetry.go does not have unit test

Is the feature request related to a problem?
Im working on #1083. This requires some changes in pkg/observability/opentelemetry.go but it doesn't have any unit test. Make contributors less confident.

As discussed, better to have a separate PR to refactor pkg/observability/opentelemetry.go to be testable before any further change

[tiationg-kho]

Solved in latest release. Please let us know if there is any other issue. Thank you!