Encode cloud name in `Cloud#getUrl` (#7573)

Co-authored-by: NYaroslav Afenkin <yaroslavafenkin@users.noreply.github.com>

core/src/main/java/hudson/slaves/Cloud.java

@@ -122,7 +122,7 @@ public abstract class Cloud extends Actionable implements ExtensionPoint, Descri
      * @return Jenkins relative URL.
      */
     public @NonNull String getUrl() {
-        return "cloud/" + name;
+        return "cloud/" + Util.rawEncode(name);
     }
 
     @Override

test/src/test/java/hudson/slaves/CloudTest.java

@@ -78,6 +78,13 @@ public class CloudTest {
         assertThat(out, containsString("doIndex called")); // doIndex
     }
 
+    @Test
+    public void cloudNameIsEncodedInGetUrl() {
+        ACloud aCloud = new ACloud("../../gibberish", "0");
+
+        assertEquals("Cloud name is encoded in Cloud#getUrl", "cloud/..%2F..%2Fgibberish", aCloud.getUrl());
+    }
+
     public static final class ACloud extends AbstractCloudImpl {
 
         protected ACloud(String name, String instanceCapStr) {