Allow to filter vulnerabilities by image name on the project dashboard - Frontend

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Main issue

This is the frontend part for #215467 (closed)

Proposal

Here's what we want to do as part of this issue:

• Extend the Security Dashboard filters to support a complex options structure in the Report type filter
  • The Container Scanning option will have optional child options to make it possible to filter vulnerabilities by specific scanned images
  • This should be implemented using the upcoming GlFormCheckboxTree component: gitlab-ui!1269 (merged)
• Properly parse API responses and format API requests to support the new JSON structure (to be agreed upon with backend)
  • Note: there is some work being done to switch from REST to GraphQL in the Security Dashboard which might affect how we go about addressing this issue
• Update the documentation to showcase the options nesting in the dropdown filter

/cc @nmccorrison