[VSA][FE] Easily distinguish selected projects in the project selector

Summary

If I want to deselect a project there isn't an easy way to find the ones that are selected and there are too many projects to scroll through and find the selected ones very easily.

Related to #330314 (comment 628211947)

What is the current bug behavior?

With a relatively sizeable list of projects, users need to scroll through the list to discover which items have already been selected.

What is the expected correct behavior?

It should be straightforward for users to discover items in the list that have been previously selected.

Proposal

• Bubble the selected groups to the top
• Alphabetically sort selected groups
• Separate selected and not selected projects with a horizontal line

Possible fixes