## Description
Adds a new exception on the stale check workflow. If the PR has the flag
of "User Testing", it will not mark it as stale.
<!-- This is an auto-generated comment: Cypress test results -->
> [!WARNING]
> Tests have not run on the HEAD
f27d4ceaf7b36227481c8a11a882c5d5c9fe07ea yet
> <hr>Wed, 21 Aug 2024 08:34:31 UTC
<!-- end of auto-generated comment: Cypress test results -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Added the `User Testing` label to the list of exempt labels,
preventing pull requests in user testing from being closed due to
inactivity. This enhances workflow management for extended reviews or
testing periods.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
