This reverts commit 96b9e8d3e3.
[Implement OpenTelemetry PR](https://github.com/grpc/grpc/pull/35292) was [reverted](96b9e8d3e3) because some tests started failing after import the changes to g3.
After investigation, we found root cause, it can be fixed both on our side and on gapic API side, we opened an issue to [gapic API team](https://github.com/googleapis/python-api-core/issues/579), this PR will includes the fixes on our side.
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Closes#35439
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Closes#35292
Xuan Wang
gRPC Team Bot
Richard Belleville
Richard Belleville