Support diff mode in awx.awx.* modules

[keilr]

Please confirm the following

• [X] I agree to follow this project's code of conduct.
• [X] I have checked the current issues for duplicates.
• [X] I understand that AWX is open source software provided for free and that I might not receive a timely response.

Feature type

New Feature

Feature Summary

During the playbook development process, we heavily use the --check and --diff modes to verify what will be changed on the controller before applying the configuration. However, as the awx.awx.* modules do not yet support the diff mode, the playbook output is not helpful during a dry run.

Select the relevant components

• [ ] UI
• [ ] API
• [ ] Docs
• [X] Collection
• [ ] CLI
• [ ] Other

Steps to reproduce

n/a

Current results

n/a

Sugested feature result

show diff output

Additional information

We use infra.controller_configuration collection to configure all AWX resources (GitOps). Therefore, a dry run with proper diff output would be very helpful in detecting issues that may potentially destroy the entire AWX instance.

[fosterseth]

@sean-m-sullivan do have some opinions on diff mode support? I realize check mode probably doesn't work very well across all awx modules, but diff (without check) probably has a better chance of being consistent and useful

[sean-m-sullivan]

I think a diff mode might be possible by reading the the api and determining if there is a change, and could be useful as well. it depends on how we want to do it, but could compare new fields to existing fields dict where they match in most modules.

[keilr]

@sean-m-sullivan @fosterseth please have a look to my PR: https://github.com/ansible/awx/pull/15118

We are using this in our custom Ansible EE and it works perfectly.