Hide add button for valid grade on position redwood page as grade is defaulting from Job

Summary:

Hide add button for valid grade on position redwood page as grade is defaulting from Job

Content (please ensure you mask any confidential information):

We have one valid grade for each Job and its defaulting on position page but client don't want to allow add other valid grade. Please let me know if we can hide

Add button on position page for valid grades.

Version (include the version you are using, if applicable):24D

Code Snippet (add any code snippets that support your topic, if applicable):