impl(o11y): introduce `http.response.status_code` #364

Job	Run time
filter	1m 14s
build(8) for showcase	1m 54s
build(8) except for gapic-generator-java	1m 57s
build(8) for gapic-generator-java	1m 4s
build (17)	1m 11s
build(25) except self-service clients	1m 53s
gapic-generator-java-bom	1m 48s
build(21) except self-service clients	1m 11s
dependency_analyzer_unit_test	1m 22s
unmanaged_dependency_check	11m 34s
build (11)	1m 12s
showcase-clirr	4m 8s
showcase (21)	1m 21s
showcase (25)	1m 13s
showcase (11)	1m 16s
showcase (17)	1m 27s
	35m 45s

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