fix(MongoSchemaCollection): prevent TypeError when type is not a string

Added a type check in mongoFieldToParseSchemaField to ensure `type` is a string
before calling `startsWith`. This prevents crashes when Parse Server processes
MongoDB schema fields with undefined, null, or unexpected type values.

Closes #9847

Author: rgunindi

src/Adapters/Storage/Mongo/MongoSchemaCollection.js

@@ -2,6 +2,14 @@ import MongoCollection from './MongoCollection';
 import Parse from 'parse/node';
 
 function mongoFieldToParseSchemaField(type) {
+  // Add type validation to prevent TypeError
+  if (!type || typeof type !== 'string') {
+    throw new Parse.Error(
+      Parse.Error.INVALID_SCHEMA_OPERATION,
+      `Invalid field type: ${type}. Expected a string. Field type must be one of: string, number, boolean, date, map, object, array, geopoint, file, bytes, polygon, or a valid relation/pointer format.`
+    );
+  }
+
   if (type[0] === '*') {
     return {
       type: 'Pointer',