Conform client's tracing interceptor to OTel's conventions #54

Job	Run time
Soundness / Check generated code	1m 56s
Cxx interop / Construct Cxx interop matrix	2s
Soundness / Swift license headers check	3s
Unit tests / Construct unit test matrix	3s
Soundness / API breakage check	2m 3s
Soundness / Broken symlinks check	3s
Soundness / Documentation check	1m 38s
Soundness / Format check	30s
Soundness / License headers check	2s
Soundness / Python lint check	4s
Soundness / Shell check	31s
Soundness / Unacceptable language check	4s
Soundness / YAML lint check	5s
Unit tests / Unit tests / Linux (6.0)	1m 30s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 42s
Unit tests / Unit tests / Linux (nightly-main)	1m 33s
Cxx interop / Cxx interop / Linux (6.0)	1m 25s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 44s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 41s
	16m 39s

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