improvement: Ask to start http server if not running #14690

Job	Run time
Gradle MacOS integration	9m 12s
Sbt integration	47m 5s
Maven integration	8m 27s
windows-latest jdk-17 unit tests 1 / 2	29m 40s
Gradle integration	8m 4s
windows-latest jdk-17 unit tests 2 / 2	30m 8s
Scala CLI integration	13m 1s
Mill integration	43m 48s
macOS-latest jdk-17 unit tests 1 / 2	56m 21s
macOS-latest jdk-17 unit tests 2 / 2	44m 9s
Bazel integration	10m 41s
ubuntu-latest jdk-17 unit tests 1 / 2	18m 20s
LSP integration tests	32m 56s
ubuntu-latest jdk-17 unit tests 2 / 2	18m 21s
Scala cross tests	32m 6s
Formatting	1m 5s
Scalafix and docs	4m 51s
Sbt-metals/scripted jdk11	2m 42s
sbt-metals/scripted (Sbt 2)	1m 26s
Scala javapc tests	1m 43s
Scala 2.11 cross tests	3m 58s
MiMa	59s
	6h 59m 3s

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