E2E: Migrate a few qa selectors to data-testid

What does this MR do and why?

As part of gitlab-org/quality/quality-engineering/team-tasks#1822 (closed)

Migrate qa-selectors or remove unused ones from:

  1. app/assets/javascripts/vue_shared/alert_details/components/system_notes
  2. app/views/admin/
  3. ee/app/views/admin

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