improvement: queue or cancel previous connect request #14383

Job	Run time
windows-latest jdk-17 unit tests 1 / 2	29m 18s
windows-latest jdk-17 unit tests 2 / 2	28m 45s
Gradle MacOS integration	11m 1s
macOS-latest jdk-17 unit tests 1 / 2	52m 41s
Sbt integration	48m 15s
macOS-latest jdk-17 unit tests 2 / 2	42m 12s
Maven integration	10m 26s
ubuntu-latest jdk-17 unit tests 1 / 2	19m 49s
Gradle integration	11m 11s
ubuntu-latest jdk-17 unit tests 2 / 2	18m 33s
Scala CLI integration	17m 7s
Mill integration	31m 20s
Bazel integration	13m 18s
LSP integration tests	34m 42s
Scala cross tests	33m 11s
Formatting	33s
Scalafix and docs	4m 58s
Sbt-metals/scripted jdk11	2m 49s
Scala javapc tests	1m 39s
Scala 2.11 cross tests	3m 54s
MiMa	45s
	6h 56m 27s

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