[FIX] Changes on department agents should mark form as dirty

[rafaelblink]

Proposed changes

Form validation isn't checking if are some new agents or event changes in existing agents to turn the "Save" button clickable, so I created a method to check this.

Issue(s)

How to test or reproduce

Omnichannel - Deparments Page

Edit departments with some agents and try to change the count, order, or even remove some and add, the "save" button won't be able to click.

Screenshots

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Hotfix (a major bugfix that has to be merged asap)
• Documentation Update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Changelog

Further comments

[renatobecker]

@rafaelblink can you, please, fix the conflicts here?

[dougfabris]

@renatobecker do you still need the fix present in this PR? I can handle the conflicts to push it!

[CLAassistant]

All committers have signed the CLA.