Allow Minimum Length for Feedback Post Descriptions

Description: Add the ability to set a minimum length for feedback post descriptions. Problem: Users may submit empty or very short feedback posts that lack sufficient information, which reduces the quality of submissions and makes it harder for admins to understand user needs. Benefit: This feature will ensure that all posts include a minimum amount of detail, enhancing overall clarity and usefulness, and saving time for admins who currently need to sort through vague or empty posts.