improvement: thresholds for folding regions #14354

Job	Run time
windows-latest jdk-17 unit tests 1 / 2	29m 41s
windows-latest jdk-17 unit tests 2 / 2	29m 41s
macOS-latest jdk-17 unit tests 1 / 2	48m 7s
Gradle MacOS integration	9m 19s
macOS-latest jdk-17 unit tests 2 / 2	37m 20s
Sbt integration	47m 9s
ubuntu-latest jdk-17 unit tests 1 / 2	18m 18s
Maven integration	10m 58s
ubuntu-latest jdk-17 unit tests 2 / 2	16m 57s
Gradle integration	11m 32s
Scala CLI integration	14m 44s
Mill integration	30m 48s
Bazel integration	12m 37s
LSP integration tests	33m 59s
Scala cross tests	33m 48s
Formatting	54s
Scalafix and docs	3m 4s
Sbt-metals/scripted jdk11	2m 35s
Scala javapc tests	1m 36s
Scala 2.11 cross tests	3m 56s
MiMa	39s
	6h 37m 42s

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