Handle when there are no scanners in the Tool Filter
Previously we showed Vendor -> Tool
groups, and the tool is always an available option to click on. Now, we show Tool -> Scanner
groups, but a tool may not have any scanners, and the new listbox component doesn't allow you to click on the group headers.
We need to discuss with UX what we should show if a tool doesn't have any scanners, and thus no items to click on.
https://gitlab.com/gitlab-org/govern/demos/sandbox/minac/test-remediations
Another example mentioned in the MR review > !131899 (comment 1601635948)
Edited by Samantha Ming