Prevent MRs from being listed twice in weekly community report

What does this MR do and why?

Excludes MRs labeled with the pingpong label. This labels signifies that the MR is waiting for additional changes from the author.

Excludes idle and stable MRs from the first section to prevent the possibility of listing them twice.

Expected impact & dry-runs

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

Action items

• N/A (If applicable) Add documentation to the handbook pages for Triage Operations =>
• (If applicable) Identify the affected groups and how to communicate to them:
  • N/A /cc @person_or_group =>
  • N/A Relevant Slack channels =>
  • N/A Engineering week-in-review