Use lint***Filter instead of ***LintKeys for more reliable test

Below functions pass lintIncludeFilter and lintExcludeFilter to lintUnusedinstead of includeLintKeys and excludeLintKeys respectively.
- sbt.internal.LintUnused#lintUnusedTask
- sbt.internal.LintUnused#lintUnusedFunc
Therefore, in the test, we had better to use lint***Filter instead of ***LintKeys.

sbt/src/sbt-test/project/lint/build.sbt

@@ -2,14 +2,18 @@ ThisBuild / doc / scalacOptions += "-Xsomething"
 
 ThisBuild / shellPrompt := { state => "sbt> " }
 
+// watch related settings
+ThisBuild / sbt.nio.Keys.watchTriggers := Seq()
+ThisBuild / sbt.nio.Keys.watchPersistFileStamps := true
+
 lazy val lintBuildTest = taskKey[Unit]("")
 
 lazy val root = (project in file("."))
   .settings(
     lintBuildTest := {
       val state = Keys.state.value
-      val includeKeys = (includeLintKeys in Global).value map { _.scopedKey.key.label }
-      val excludeKeys = (excludeLintKeys in Global).value map { _.scopedKey.key.label }
+      val includeKeys = (lintIncludeFilter in Global).value
+      val excludeKeys = (lintExcludeFilter in Global).value
       val result = sbt.internal.LintUnused.lintUnused(state, includeKeys, excludeKeys)
       result foreach {
         case (_, "ThisBuild / doc / scalacOptions", _) => ()