Fix luceneEclipseJdt task not invoked by gradle eclipse #14868.

Author: dweiss

build-tools/build-infra/src/main/groovy/lucene.ide.eclipse.gradle

@@ -30,6 +30,7 @@ if (gradle.startParameter.taskNames.contains("eclipse")) {
   project.pluginManager.apply("java-base")
   project.pluginManager.apply("eclipse")
 
+  def resources = rootProject.file("gradle/ide/eclipse")
   def eclipseJavaVersion = eclipseJavaVersionOption.get()
   def relativize = { File other -> rootProject.rootDir.relativePath(other).toString() }