Add metrics related to virtual threads #6996

Job	Run time
build	6m 10s
checkstyle	4m 8s
copyright	3m 29s
shellcheck	3m 9s
tests/core	11m 1s
tests/tck-cdi	18m 16s
tests/native-image-mp-1-linux	6m 59s
tests/tck-rest	14m 31s
spotbugs/core	10m 38s
tests/tck-others	16m 52s
tests/native-image-mp-2-linux	11m 29s
spotbugs/integrations	7m 13s
tests/it	14m 17s
spotbugs/others	12m 41s
tests/native-image-mp-3-linux	6m 51s
tests/dbclient	9m 2s
tests/native-image-se-1-linux	6m 43s
archetypes/r1-jar	6m 45s
tests/native-image-inject-linux	6m 23s
docs	4m 41s
archetypes/r2-jar	6m 41s
tests/native-image-mp-1-macos	10m 30s
tests/dbclient-oracle	15m 49s
archetypes/r3-jar	5m 55s
tests/native-image-mp-2-macos	15m 31s
tests/others	12m 26s
archetypes/r4-jar	6m 54s
tests/native-image-mp-3-macos	6m 59s
archetypes/r5-jar	5m 5s
tests/native-image-se-1-macos	7m 4s
examples/linux	12m 1s
javadoc (core)	7m 3s
examples/macos	10m 52s
archetypes/legacy	4m 53s
javadoc (integrations)	5m 41s
tests/native-image-inject-macos	6m 47s
javadoc (others)	8m 4s
tests/packaging-jar-linux	7m 23s
quickstarts/linux	11m 39s
tests/packaging-jlink-linux	9m 16s
quickstarts/macos	10m 34s
tests/packaging-jar-macos	5m 20s
tests/packaging-jlink-macos	6m 24s
tests/results	11s
gate	1s
	6h 20m 21s

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