refactor: Use default concurrency queue #11612

Job	Run time
windows-latest jdk-17 unit tests 1 / 2	27m 6s
Gradle MacOS integration	14m 14s
windows-latest jdk-17 unit tests 2 / 2	24m 1s
Sbt integration	50m 18s
macOS-latest jdk-17 unit tests 1 / 2	21m 5s
Maven integration	8m 28s
macOS-latest jdk-17 unit tests 2 / 2	20m 46s
Gradle integration	11m 21s
ubuntu-latest jdk-17 unit tests 1 / 2	21m 28s
Scala CLI integration	19m 48s
ubuntu-latest jdk-17 unit tests 2 / 2	18m 6s
Mill integration	17m 24s
ubuntu-latest jdk-8 unit tests 1 / 2	23m 40s
LSP integration tests	45m 28s
ubuntu-latest jdk-8 unit tests 2 / 2	21m 47s
Scala cross tests	56m 13s
Formatting	57s
Scalafix and docs	11m 10s
Sbt-metals/scripted jdk8	1m 52s
Scala javapc tests	2m 50s
Scala3 latest NIGHTLY cross test	4m 43s
MiMa	50s
	7h 3m 35s

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