[gh-11363] Strip outer quotes from jvm.config arguments

Quotes in jvm.config are for grouping/escaping, but shouldn't be
passed to the JVM. Strip them before re-quoting for batch script.

Author: gnodet

apache-maven/src/assembly/maven/bin/JvmConfigParser.java

@@ -69,8 +69,13 @@ public static void main(String[] args) {
                 line = line.replace("${MAVEN_PROJECTBASEDIR}", mavenProjectBasedir);
                 line = line.replace("$MAVEN_PROJECTBASEDIR", mavenProjectBasedir);
 
-                // Quote the argument to protect special characters
-                // Escape any existing quotes by doubling them
+                // Strip outer quotes if present (they're just for grouping in jvm.config)
+                if (line.startsWith("\"") && line.endsWith("\"") && line.length() > 1) {
+                    line = line.substring(1, line.length() - 1);
+                }
+
+                // Quote the argument to protect special characters for batch script
+                // Escape any quotes by doubling them (batch script convention)
                 line = line.replace("\"", "\"\"");
 
                 // Append quoted argument with space separator