Added some permission tests for accessory api endpoints

[marcusmoore]

Description

On a testing kick...

This PR adds some simple permission tests for most of the accessory api routes. Definitely a starting point and will be built upon.

Type of change

• Testing

[what-the-diff]

PR Summary

• Testing Permission for Deleting Accessories
  A new test is added to ensure appropriate permissions are required for deleting an accessory in our system.
• Testing Permission for Viewing Accessories List
  Another test is added to verify that the appropriate level of access is required to view the list of accessories.
• Testing Permission for Displaying an Accessory
  We've implemented a test to confirm that the correct permissions are needed to display details of any accessory.
• Testing Permission for Saving Accessories
  A new testing mechanism confirms users require the right permission level to save or upload an accessory.
• Testing Permission for Updating Accessories
  Another test addition ensures that only users with suitable access rights can update accessory details.