ci: only add non-draft PRs to project board #3

Job	Run time
opentelemetry-semantic-conventions	20s
opentelemetry-getting-started	25s
opentelemetry-exporter-opencensus	21s
opentelemetry-api	21s
opentelemetry-opentracing-shim	25s
opentelemetry-proto-gen-latest	18s
opentelemetry-sdk	32s
opentelemetry-exporter-otlp-proto-http	24s
opentelemetry-exporter-zipkin-json	18s
opentelemetry-propagator-jaeger	20s
opentelemetry-exporter-otlp-proto-grpc-latest	25s
opentelemetry-exporter-otlp-proto-common	17s
opentelemetry-propagator-b3	18s
opentelemetry-exporter-otlp-combined	18s
opentelemetry-exporter-zipkin-combined	23s
opentelemetry-opencensus-shim	20s
opentelemetry-exporter-prometheus	22s
opentelemetry-exporter-zipkin-proto-http	21s
opentelemetry-test-utils	23s
	6m 51s

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