Generate Semantic Conventions 1.28.0 (#4218) #393

Job	Run time
opentelemetry-api	43s
opentelemetry-exporter-opencensus	42s
opentelemetry-exporter-otlp-proto-common	41s
opentelemetry-getting-started	57s
opentelemetry-opentracing-shim	39s
opentelemetry-opencensus-shim	42s
opentelemetry-proto	25s
opentelemetry-sdk	48s
opentelemetry-semantic-conventions	34s
opentelemetry-exporter-otlp-combined	47s
opentelemetry-exporter-otlp-proto-grpc	48s
opentelemetry-exporter-otlp-proto-http	49s
opentelemetry-exporter-prometheus	38s
opentelemetry-exporter-zipkin-combined	37s
opentelemetry-exporter-zipkin-json	40s
opentelemetry-exporter-zipkin-proto-http	49s
opentelemetry-propagator-jaeger	36s
opentelemetry-test-utils	41s
opentelemetry-propagator-b3	41s
	13m 17s

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