Add option to delete user profile in Profile Selector (adds #38243)

[JuhoErvasti]

This is my implementation of this somewhat old feature request #38243 to be able to remove user profiles in the GUI without having to manually delete the folder.

• I figured that a logical place to add this feature is the recently added QgsUserProfileSelectionDialog.

• Since not everyone has the selection dialog enabled I thought I'd add a button to open the Selector from Settings > User Profiles

• I've also disabled deleting the default profile, although I'm not sure it's necessary

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If this is at all an okay direction for the Profile Selector, personally I'd like for it to have even more features:

• Being able to select and delete multiple profiles
• Being able to add profiles without immediately starting a new process
• Being able to rename profiles
• Maybe being able to reset a profile?
• Maybe being able to edit the profile icons?

[github-actions]

🪟 Windows builds ready!

Windows builds of this PR are available for testing here. Debug symbols for this build are available here.

(Built from commit 7a44d29)

[3nids]

This is super nice. I would be in favor of adding this to 3.40. Thoughts?

[JuhoErvasti]

I fixed some oversights

• When opening the dialog from the GUI the active profile is greyed out and cannot be opened or removed
  • I thought this would be good since it matches the behavior of the User Profiles menu
• Also as per Gustry's review the action now has ... to indicate that you're opening a dialog

This is super nice. I would be in favor of adding this to 3.40. Thoughts?

For my part I'd like that if it's possible.

[nyalldawson]

I'd suggest we re-word "remove profile" to "delete profile" everywhere, as it's clearer that it's a destructive action rather then just removing it from the list. (We use "remove" elsewhere for actions like removing a connection to a geopackage, where the file won't be actually be deleted).

[JuhoErvasti]

I'd suggest we re-word "remove profile" to "delete profile" everywhere, as it's clearer that it's a destructive action

That makes a lot of sense, it was very inconsistent too. I've changed the term to 'delete' across the board here 3658792