[Events] Duplicates of new categories when adding new event and creating new category

[ystrotska]

Environment: Windows 10 Pro, Google Chrome version 103.0.5060.114 (development)(64-bit). Reproducible: always. Build found: e3b1dcd Priority: medium Severity: low

Preconditions Sign in as a super admin or any user authorized to create events (https://eplast.westeurope.cloudapp.azure.com/signin)

Steps to reproduce

1. Go to the 'Події' tab in the user's profile
2. Click on 'Створити нову подію' option
3. Scroll down to 'Тип події' and choose any of the types.
4. Go to the "Категорія" and click on the "Додати нову категорію" option
5. In the popup window put the new category name in the "Назва категорії" and choose "Секція"
6. Click the "Додати" button more than 1 time. (for example 3 times)
7. Check the added new category in the "Категорія" section
8. Go to the left-side menu, "Події", and see the created category in the indicated "Тип події"

Actual result

1. A newly created category duplicates appear when adding a new event and creating a new category. The quantity of duplicates depends on the number of clicks made while confirming creating the new category.

2. The newly created category appears or in all of the "Акція", "Вишкіл", "Табір" types, or in any of them.
3. The super admin has no option to delete the category if needed.

Expected result

1. No category duplicates should appear when creating a new category.
2. The newly created category should appear in the chosen type of events.
3. The super admin should have the option to delete the category.

Postconditions Please delete all the categories in the "Акція", "Вишкіл", and "Табір" types, created for testing of prod.