categories fetch

To fetch categories, you usually need to request each category individually by its unique ID. So, to fetch multiple categories, you would need to make separate API requests for each category.

1. We create an array of category IDs from the post.categories array.
2. We use Promise.all to concurrently fetch each category by making individual API requests within the loop.
3. If a category fetch fails, it returns null, which we filter out later to ensure only successfully fetched categories are stored in the fetchedCategories array.

By using this approach, we fetch each category one by one and then filter out any failed requests. This allows you to retrieve the category names individually based on their IDs