Update integrations endpoints to v3

[ckeif-duo]

Updates references to admin/v2/integrations to admin/v3/integrations. The v3 version of the endpoints adds a small breaking change to the integrations fields.

Description

Updates references to admin/v2/integrations to admin/v3/integrations and adds handling for the new user_access field on create/update.

Motivation and Context

The v3 endpoints add a new user_access field and changes the behavior of groups_allowed.

Previously the groups_allowed field by itself determined which users could authenticate with the application as described here. Now a third state has been added which allows no users to authenticate.

Because of that, the user_access field has been added to express this more cleanly, and groups_allowed can only be provided if user_access === "PERMITTED_GROUPS".

How Has This Been Tested?

Local test (sorry for blurry video, had to export as 480p to upload :))
https://github.com/user-attachments/assets/33a82208-c100-4ae2-ae7b-3ea594f2a12e

Test Script
https://gist.github.com/ckeif-duo/ae530de40a61ed9ce53af38b9478faf0

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)