Update the settings in build.gradle.kts for the validate task

[jwren]

Local runs are producing different output than the Kokoro bot, hence the continued volatility

Verify has been disabled for the time being as the CI bots currently throw an exception (see below)

[jwren]

Status: the bots, both as GitHub tasks as well as Kokoro, are yielding this message which doesn't appear with local runs of the script:

> Task :flutter-idea:verifyPlugin
  Starting the IntelliJ Plugin Verifier 1.379
  Verification reports directory: /home/runner/work/flutter-intellij/flutter-intellij/flutter-idea/build/reports/pluginVerifier
  Exception in thread "main" java.nio.file.NoSuchFileException: /home/runner/.pluginVerifier/extracted-plugins
  	at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
  	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
  	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
  	at java.base/sun.nio.fs.UnixFileSystemProvider.implDelete(UnixFileSystemProvider.java:248)
  	at java.base/sun.nio.fs.AbstractFileSystemProvider.delete(AbstractFileSystemProvider.java:105)
  	at java.base/java.nio.file.Files.delete(Files.java:1152)
  	at com.jetbrains.plugin.structure.base.utils.FileUtilKt$forceRemoveDirectory$1.postVisitDirectory(FileUtil.kt:140)
  	at com.jetbrains.plugin.structure.base.utils.FileUtilKt$forceRemoveDirectory$1.postVisitDirectory(FileUtil.kt:131)
  	at java.base/java.nio.file.Files.walkFileTree(Files.java:2828)
  	at java.base/java.nio.file.Files.walkFileTree(Files.java:2882)
  	at com.jetbrains.plugin.structure.base.utils.FileUtilKt.forceRemoveDirectory(FileUtil.kt:131)
  	at com.jetbrains.plugin.structure.base.utils.FileUtilKt.forceDeleteIfExists(FileUtil.kt:84)
  	at com.jetbrains.pluginverifier.PluginVerifierMain.getPluginsExtractDirectory(PluginVerifierMain.kt:84)
  	at com.jetbrains.pluginverifier.PluginVerifierMain.main(PluginVerifierMain.kt:119)