Disable equals in JsonPath~ and XPathAssertions

Issue: SPR-17091

spring-test/src/main/java/org/springframework/test/web/reactive/server/JsonPathAssertions.java

@@ -176,4 +176,11 @@ public class JsonPathAssertions {
 		return this.bodySpec;
 	}
 
+
+	@Override
+	public boolean equals(Object obj) {
+		throw new AssertionError("Object#equals is disabled " +
+				"to avoid being used in error instead of JsonPathAssertions#isEqualTo(String).");
+	}
+
 }

spring-test/src/main/java/org/springframework/test/web/reactive/server/XpathAssertions.java

@@ -163,7 +163,6 @@ public class XpathAssertions {
 		});
 	}
 
-
 	private WebTestClient.BodyContentSpec assertWith(CheckedExceptionTask task) {
 		try {
 			task.run();
@@ -190,6 +189,13 @@ public class XpathAssertions {
 	}
 
 
+	@Override
+	public boolean equals(Object obj) {
+		throw new AssertionError("Object#equals is disabled " +
+				"to avoid being used in error instead of XPathAssertions#isEqualTo(String).");
+	}
+
+
 	/**
 	 * Lets us be able to use lambda expressions that could throw checked exceptions, since
 	 * {@link XpathExpectationsHelper} throws {@link Exception} on its methods.