Make group report lists more readable

What does this MR do and why?

Make group lists more readable by expanding issue/MR references to show their title, and to force labels to start on a new line. There are no processing/policy changes, just formatting.

For example, the Merge requests needing attention report

before

• @digitalmoksha - gitlab-org/gitlab!160936 devopsplan, frontend, groupknowledge, pipelinetier-1, sectiondev

after

• @digitalmoksha - Use rich text editor in snippets description (gitlab-org/gitlab!160936) • Brett Walker
  devopsplan, frontend, groupknowledge, pipelinetier-1, sectiondev

See !3056 (comment 2143607957) for examples of the 3 different type of reports effected.

Expected impact & dry-runs

These are strongly recommended to assist reviewers and reduce the time to merge your change.

See https://gitlab.com/gitlab-org/quality/triage-ops/-/tree/master/doc/scheduled#testing-policies-with-a-dry-run on how to perform dry-runs for new policies.

See https://gitlab.com/gitlab-org/quality/triage-ops/-/blob/master/doc/reactive/best_practices.md#use-the-sandbox-to-test-new-processors on how to make sure a new processor can be tested.

Action items

• If adding environment variables for reactive processors, update config/triage-web.yaml and .gitlab/ci/triage-web.yml
• (If applicable) Add documentation to the handbook pages for Triage Operations =>
• (If applicable) Identify the affected groups and how to communicate to them:
  • /cc @person_or_group =>
  • Relevant Slack channels =>
  • Engineering week-in-review