Conform client's tracing interceptor to OTel's conventions #49

Job	Run time
Soundness / Check generated code	1m 58s
Cxx interop / Construct Cxx interop matrix	4s
Soundness / Swift license headers check	5s
Unit tests / Construct unit test matrix	3s
Soundness / API breakage check	1m 40s
Soundness / Documentation check	1m 33s
Soundness / Unacceptable language check	4s
Soundness / License headers check	2s
Soundness / Broken symlinks check	4s
Soundness / Shell check	31s
Soundness / Format check	41s
Soundness / YAML lint check	5s
Soundness / Python lint check	14s
Unit tests / Unit tests / Linux (6.0)	1m 17s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 31s
Unit tests / Unit tests / Linux (nightly-main)	1m 25s
Cxx interop / Cxx interop / Linux (6.0)	1m 20s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 32s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 31s
	15m 40s

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