feat(medusa, admin-ui): Improvements to product categories (#3416)

.changeset/smart-spies-bake.md

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+---
+"@medusajs/admin-ui": patch
+"@medusajs/medusa": patch
+---
+
+feat(medusa, admin-ui): Improvements to product categories
+- Adds name as required in category create form
+- Adds name and handle as required in category edit form
+- Updates message on create/update forms
+- Adds category indicators for is_internal and is_active fields in the tree list
+- Fixes bug where tree is not reset when update fails