Build: Fix hadoop integ test error on windows (#24885)

This commit fixes the error message to escape the dollar sign for
referencing a literal `$HADOOP_HOME`, which caused an error while trying
to generate an error.

closes #24878

plugins/repository-hdfs/build.gradle

@@ -137,7 +137,7 @@ if (Os.isFamily(Os.FAMILY_WINDOWS)) {
         Files.exists(path.resolve("bin").resolve("hdfs.dll"))) {
       fixtureSupported = true
     } else {
-      throw new IllegalStateException("HADOOP_HOME: " + path.toString() + " is invalid, does not contain hadoop native libraries in $HADOOP_HOME/bin");
+      throw new IllegalStateException("HADOOP_HOME: ${path} is invalid, does not contain hadoop native libraries in \$HADOOP_HOME/bin");
     }
   }
 } else {