Conform server tracing interceptor to OTel's conventions #53

Job	Run time
Soundness / Check generated code	1m 56s
Soundness / Swift license headers check	4s
Unit tests / Construct unit test matrix	2s
Cxx interop / Construct Cxx interop matrix	4s
Soundness / API breakage check	1m 54s
Soundness / Documentation check	1m 37s
Soundness / Unacceptable language check	3s
Soundness / Broken symlinks check	3s
Soundness / Format check	31s
Soundness / License headers check	2s
Soundness / Python lint check	6s
Soundness / Shell check	31s
Soundness / YAML lint check	2s
Unit tests / Unit tests / Linux (6.0)	1m 28s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 43s
Unit tests / Unit tests / Linux (nightly-main)	1m 33s
Cxx interop / Cxx interop / Linux (6.0)	1m 26s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 46s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 36s
	16m 27s

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