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Move all yarn.lock parsing into formats/yarn and stop pinning non-registry copies #366

Job	Run time
linux-bins	2m 42s
sbt 1.13.0 e2e_sbt_vendor_build / windows-latest	6m 58s
sbt 1.13.0 e2e_sbt_build / windows-latest	7m 18s
image	12m 47s
mill 1.1.10	2m 50s
scala-cli 1.17.1	1m 59s
mill 0.12.17	2m 13s
mill 0.11.13	4m 10s
sbt 1.2.8 / jdk 8 / vendored	6m 12s
sbt 1.9.9 / jdk 17 / agent	1m 59s
sbt 1.3.13 / jdk 8 / vendored	4m 28s
sbt 0.13.18 / jdk 8 / vendored	5m 31s
sbt 1.13.0 / jdk 17 / hosted	8m 30s
sbt 1.13.0 / jdk 17 / agent	2m 21s
sbt 1.9.9 / jdk 17 / hosted	6m 43s
sbt 0.13.18 / jdk 8 / hosted	4m 49s
sbt 0.13.18 / jdk 8 / agent	1m 43s
sbt 2.0.9 / jdk 17 / agent	2m 18s
sbt 1.2.8 / jdk 8 / agent	1m 48s
sbt 2.0.9 / jdk 17 / hosted	9m 13s
sbt 2.0.9 / jdk 21 / vendored	6m 38s
sbt 1.13.0 / jdk 21 / vendored	4m 32s
sbt 1.13.0 / jdk 21 / agent	3m 11s
sbt 1.9.9 / jdk 17 / vendored	4m 4s
sbt 2.0.9 / jdk 17 / vendored	6m 21s
sbt 1.2.8 / jdk 8 / hosted	7m 41s
sbt 2.0.9 / jdk 21 / hosted	9m 10s
sbt 1.13.0 / jdk 17 / vendored	4m 40s
sbt 1.3.13 / jdk 8 / agent	2m 18s
sbt 2.0.9 / jdk 21 / agent	2m 5s
sbt 1.3.13 / jdk 8 / hosted	7m 28s
sbt 1.13.0 / jdk 21 / hosted	7m 14s
	2h 41m 54s