Log root cause exceptions in mappers (#2837)

Fix `IcebergExceptionMapper` and `PolarisExceptionMapper` to pass exceptions as "cause" to the logger (as opposed to unreferenced log parameters).

Author: dimas-b

runtime/service/src/main/java/org/apache/polaris/service/exception/IcebergExceptionMapper.java

@@ -98,7 +98,8 @@ public Response toResponse(RuntimeException runtimeException) {
     } else {
       getLoggerForExceptionLogging()
           .atLevel(responseCode > 500 ? Level.INFO : Level.DEBUG)
-          .log("Full RuntimeException", runtimeException);
+          .setCause(runtimeException)
+          .log("Full RuntimeException");
     }
 
     ErrorResponse icebergErrorResponse =

runtime/service/src/main/java/org/apache/polaris/service/exception/PolarisExceptionMapper.java

@@ -68,7 +68,8 @@ public Response toResponse(PolarisException exception) {
     getLogger()
         .atLevel(
             status.getFamily() == Response.Status.Family.SERVER_ERROR ? Level.INFO : Level.DEBUG)
-        .log("Full PolarisException", exception);
+        .setCause(exception)
+        .log("Full PolarisException");
 
     ErrorResponse errorResponse =
         ErrorResponse.builder()