Warn before closing unsaved changes in collection settings

[busy-panda]

I have checked the following:

• I've searched existing issues and found nothing related to my issue.

Describe the feature you want to add

Like it was done in #1162 for requests, the app should warn the user when he has unsaved changes in "collection settings" before closing the tab or the app.

Currently in this case, the app is closed and all unsaved changes made in collection settings are lost.

warn.before.closing.collection.settings.mp4

Mockups or Images of the feature

When changes are entered in a tab, like for requests, an orange circle should appear in the tab name to tell the user that he has unsaved changes