Group missing categories report with project filter

What does this MR do and why?

Describe in detail what your merge request does and why.

Moves the stage missing categories report to run on the gitlab-org group but filtered on specific projects.

Expected impact & dry-runs

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

Dry run: https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/2145864048

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 =>
  • Engineering week-in-review

Closes #924 (closed)