impl(o11y): introduce `http.response.status_code` #17119

Job	Run time
owlbot-py	48s
gitignore_correctness	53s
owlbot-yaml	54s
gapic-bom	1m 47s
root-pom	1m 46s
generate-readme	56s
package_name_check	31s
group_id_check_for_maps_libraries	7m 25s
	15m 0s

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