Update and fix resolvable note icons for easier recognition

What does this MR do?

Update and fix resolvable note icons for easier recognition

Before	After

Are there points in the code the reviewer needs to double check?

Regressed in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12931/diffs#79ea7020ff2bdc6a515cb8c8bf815c6e3e436386_544_547 where we added the following CSS and icon_status_success.svg wasn't built with external fill in mind.

svg {
  /* ... */
  path {
     fill: currentColor;
  }
}

Why was this MR needed?

Resolvable note icons regressed to filled in circles. UX was inspired by the bug and decided to move to a filled in circle version of the checkmark.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

Closes #36582 (closed)