Handle empty profile folders in Favorites

[lauren-li]

Describe the bug
After removing all favorites associated with a profile, the profile’s folder in the Favorites section remains until Zowe Explorer is restarted.

To Reproduce

1. Favorite an item in any view (DS, USS, or JES), noting the profile name.
2. Under the profile node’s folder in Favorites, remove the favorite you added in step 1, along with any other favorites for that profile.
3. Observe that the empty profile node folder remains in the Favorites section, and cannot be removed until Zowe Explorer is restarted.

Screenshots
(The gif below is the USS view, but this is an issue for all 3 views.)

Expected behavior

• When all favorites associated with a profile are removed, then the profile’s folder in the Favorites section should also go away immediately.
• Alternatively (or additionally), perhaps there should be a context menu option to allow users to manually remove profile folders in the Favorites section

Desktop (please complete the following information):

• OS: Mac
• Zowe Explorer Version: 1.9.0

Additional context

• This was mentioned as an iterative improvement during Favorites grouping implementation in PR 991.
• May be related to issue Unable to remove favorite profile from JOBS tree #1020 (Unable to remove favorite profile from JOBS tree)

[lauren-li]

Resolved via PR #1071 (Handle empty profile folders in Favorites).