Prepare for sunset icon removal from core

[NotMyFault]

This is a preparation for jenkinsci/jenkins#5778 which removes sunset icons.

Otherwise we're lacking an icon here:

Which has been mitigated:

cc @centic9

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Please describe what you did
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[NotMyFault]

@centic9 thanks for the quick merge, can we may get a release? The mentioned core PR is blocked until plugin PRs are merged and included in some release.