[Feat] Implement redesign of signature icons and tooltips

[andaaron]

See attachments for current implementation.

Verified signature:

Unverified signature:

These 2 cases are not enough anymore. We need a redesign. On August 30th we decided to make the following changes:

1. Instead of a single shield icon for any signature we would show 2 separate icons: 1 for cosign and 1 for notation.

• The icons themselves should be coming from the open source resources of the cosign and notation project.
• The icon coloring would reflect the following states:
  • Red if there is no signature of the given type (cosign/notation) applicable to the specific image/tag.
  • Amber if there is at least one signature of the given type (cosign/notation) applicable to the specific image/tag, but all of these signatures have "trusted" set to "false"
  • Green if there is at least one signature of the given type (cosign/notation) applicable to the specific image/tag, and at least one of these signatures has "trusted" set to "true"

2. Update the tooltip to remove the "verified", "trusted", "type" information, as it would be already reflected in the icon coloring, no need to include it in the tooltip. The tooltip would continue to include the "Author: [...]" information, as it is presented in current implementation.