text: Title: cancelled vs canceled - standardize spelling in codebase
  Body: ### Please confirm the following
  
  - [X] I agree to follow this project's [code of conduct](https://docs.ansible.com/ansible/latest/community/code_of_conduct.html).
  - [X] I have checked the [current issues](https://github.com/ansible/awx/issues) for duplicates.
  - [X] I understand that AWX is open source software provided for free and that I might not receive a timely response.
  - [X] I am **NOT** reporting a (potential) security vulnerability. (These should be emailed to `security@ansible.com` instead.)
  
  ### Bug Summary
  
  There are a couple of places that still use "cancelled" even though AWX appears to have standardized "canceled"
  https://github.com/search?q=repo%3Aansible%2Fawx%20cancelled&type=code <- only one in particular looks to be problematic from a functionality perspective within the UI for WSRelay.
  I have not tested this to know if it impacts functionality though.
  
  ### AWX version
  
  24.3.1
  
  ### Select the relevant components
  
  - [X] UI
  - [ ] UI (tech preview)
  - [ ] API
  - [ ] Docs
  - [ ] Collection
  - [ ] CLI
  - [X] Other
  
  ### Installation method
  
  docker development environment
  
  ### Modifications
  
  no
  
  ### Ansible version
  n/a
  
  ### Operating system
  
  n/a
  
  ### Web browser
  
  n/a
  
  ### Steps to reproduce
  
  search codebase for "cancelled" or "canceled" and compare
  
  ### Expected results
  
  n/a
  
  ### Actual results
  
  n/a
  
  ### Additional information
  
  _No response_