Tag categories bugs in admin

**Describe the Bug**
Tag categories is not working properly in the admin section of the product

**Expected Behaviour**
Bug 1: Can select a tag category when creating or editing a tag in admin
Bug 2: Can see all tag categories in the admin section

**Actual Behaviour**
Bug 1: Cannot select a tag category when creating or editing a tag
Bug 2: Tag categories list is empty if you open the edit dialog on a tag, then nav to the categories page

** Steps To Reproduce**
Steps to reproduce the behaviour:
Go to admin area
Click on Tags in side nav
Bug 1. Edit a tag -> tag category drop down is empty
Bug 2. Edit a tag -> Cancel -> Click Categories tab -> see empty table

** Additional context**
Bug 1:

Bug 2:

Confirm this task meets our team [**Definition of Ready (DoR)**](https://www.figma.com/board/XmNkN600aAVWFCBmSDdt10/Team-Documents?node-id=1-2&t=Xjd6nHZZ7YlnoOrD-4) before moving to the **Next Sprint** column.

Confirm this task meets our team [**Definition of Done (DoD)**](https://www.figma.com/board/XmNkN600aAVWFCBmSDdt10/Team-Documents?node-id=3-21&t=Xjd6nHZZ7YlnoOrD-4) before moving to the **Done** column.

Start in the admin area's Tags flow from the side-nav entry, then inspect the tag edit dialog and Categories tab. Reproduce both reported sequences: the empty category dropdown and the empty table after cancelling an edit. Done means tag categories can be selected while creating or editing tags and the categories list remains visible.

Written by the indexing model from the issue text.