In this commit, we introduce unit tests for the `MutatingAdmission`
webhook specifically for the `Work` resource. The mutation webhook
tests include the following:
- Handles decode errors and denies admission when decoding fails.
- Provides full coverage of policy mutation, including setting default
and validating no unnecessary patches.
Signed-off-by: Mohamed Awnallah <mohamedmohey2352@gmail.com>