chore: expand gerrit delete activities script

[joanagmaia]

Summary

• Replaced hardcoded type and date filters with --type and --before-date CLI flags, making the script
  reusable for different cleanup scenarios without code changes.
• Added a pre-flight count step that queries all three stores (Postgres, Tinybird activities, Tinybird
  activityRelations) in parallel before any deletion, so the operator can see the blast radius upfront.
• Added an interactive confirmation prompt (skippable with --yes/-y) to prevent accidental mass deletions.
• Refactored Postgres deletion from a Tinybird-ID-driven batched approach to a direct chunked DELETE ...
  WHERE ... LIMIT 10k loop, removing the dependency on Tinybird to drive the Postgres cleanup.
• Added input validation for --before-date (YYYY-MM-DD format check) and --type (enum guard against
  VALID_GERRIT_TYPES), with an explicit warning when neither filter is provided (would delete all Gerrit
  activities).

---

Note

Medium Risk
Medium risk because it changes a destructive data-deletion script, expanding what can be deleted via new CLI filters and a new Postgres deletion strategy; mistakes could remove more data than intended despite added confirmations/validation.

Overview
Makes the Gerrit cleanup script reusable and safer by replacing hardcoded delete criteria with validated CLI flags (--type, --before-date) plus a --yes/-y confirmation bypass and improved --help/warnings.

Changes execution flow to do pre-flight Tinybird row counts, require an interactive confirmation by default, delete matching Postgres activityRelations via 10k chunked batches (no longer driven by Tinybird ID queries), then trigger Tinybird delete jobs and persist job IDs/results to /tmp while waiting (up to 6h) for completion. Also adds a cleanup-gerrit-activities npm script entry.

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