improvement: queue or cancel previous connect request #13728

Job	Run time
windows-latest jdk-17 unit tests 1 / 2	24m 55s
Gradle MacOS integration	15m 29s
windows-latest jdk-17 unit tests 2 / 2	25m 27s
Sbt integration	48m 53s
macOS-12 jdk-17 unit tests 1 / 2	59m 18s
Maven integration	8m 19s
macOS-12 jdk-17 unit tests 2 / 2	42m 6s
Gradle integration	8m 31s
ubuntu-latest jdk-17 unit tests 1 / 2	25m 14s
Scala CLI integration	12m 39s
ubuntu-latest jdk-17 unit tests 2 / 2	18m 36s
Mill integration	29m 47s
Bazel integration	11m 3s
LSP integration tests	34m 45s
Scala cross tests	34m 8s
Formatting	45s
Scalafix and docs	5m 33s
Sbt-metals/scripted jdk11	3m 2s
Scala javapc tests	1m 33s
Scala 2.11 cross tests	3m 59s
MiMa	47s
	6h 54m 49s

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