Stop printing Skipped message in the trusted certificate helper

When there are issues with user's certs, they often get confused by these messages, as they print for all files in the folder that aren't symlinks, including valid certficates.

To be copied at this stage, the cert needs to be valid, and be a symlink. It's filename a hash. Rather than print what was skipped (which includes the valid targets of the symlinks). Let's just print what was linked over, and let the absense of a message work better for debugging.

Related to #4333 (closed)