fix: imporve validation message in search contact

src/main/java/fr/insee/survey/datacollectionmanagement/contact/validation/ValidContactParam.java

@@ -12,7 +12,7 @@
 @Target({ ElementType.FIELD, ElementType.PARAMETER })
 @Retention(RetentionPolicy.RUNTIME)
 public @interface ValidContactParam {
-    String message() default "Invalid parameter";
+    String message() default "Invalid searchParam value.Only identifier, email and name are valid";
     Class<?>[] groups() default {};
     Class<? extends Payload>[] payload() default {};
 }