Make quick action "commands applied" banner more useful

internal customer since many GitLabbers (including many developers at GitLab) use quick actions.

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Problem

For some quick actions you rely on the system note to direct you to the next step. For example, moving and promoting issues posts a system note with a link to the new issue or epic. If a user has activity set to Comments only they don't see that system note, leaving the user to manually search.

Relevant slack conversation- https://gitlab.slack.com/archives/C0AR2KW4B/p1546968466223900

Design

When a quick action (or quick actions) are successfully applied, the alert should say exactly which actions were applied.

Notes

• The link font-weight should be 700
• On hover, the links should have text-decoration: underline
• The text should match the quick action preview text, but with everything in past tense. For example, the preview of the above screenshot looks like this: