Add UI action to copy comment link to clipboard

Description

Within GitLab comments, there is the cool hidden feature to copy a link of a specific comment into your clipboard.
To copy a comment URL, you right-click the time element within the system note message and copy the link.

When pasting this URL into a comment, it links to the actual comment fragment and is nicely displayed via pattern #ISSUENR (comment COMMENTNR).

Right now, this helpful feature is not very discoverable.

Proposal

I'd suggest to add a user action "Copy comment to clipboard" that is displayed in the "More actions" dropdown of each comment.

cc @victorwu