Migrate triage serverless code, specs, and CI config

After merge

Issue to un-close:

• #121 (closed)
• #136
• #142
• #150 (closed)
• #158 (closed)
• #22 (closed)
• #54
• #6
• #75
• #92

Action items

• (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 =>
  • Replicate project variables from https://gitlab.com/gitlab-org/quality/triage-serverless/-/settings/ci_cd
  • Week-in-review

Closes https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/1084, https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/1085.