Conform server tracing interceptor to OTel's conventions #63

Job	Run time
Soundness / Swift license headers check	3s
Soundness / Check generated code	2m 1s
Cxx interop / Construct Cxx interop matrix	3s
Unit tests / Construct unit test matrix	3s
Soundness / API breakage check	1m 58s
Soundness / Documentation check	1m 32s
Soundness / License headers check	5s
Soundness / Unacceptable language check	3s
Soundness / Broken symlinks check	3s
Soundness / Python lint check	4s
Soundness / Shell check	36s
Soundness / Format check	36s
Soundness / YAML lint check	3s
Cxx interop / Cxx interop / Linux (6.0)	1m 32s
Cxx interop / Cxx interop / Linux (nightly-6.1)	2m 14s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 57s
Unit tests / Unit tests / Linux (6.0)	1m 40s
Unit tests / Unit tests / Linux (nightly-6.1)	1m 48s
Unit tests / Unit tests / Linux (nightly-main)	1m 53s
	18m 14s

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