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
Moderate risk because it changes a destructive cleanup workflow (Postgres deletes + Tinybird delete jobs) and broadens what can be targeted via CLI filters; safeguards were added but misuse could still cause large deletions.

Overview
Extends the Gerrit activities cleanup tooling by adding a cleanup-gerrit-activities script and making the cleanup script configurable via CLI flags (--type, --before-date, --tb-token, --dry-run, --yes).

The script now does a pre-flight count across PostgreSQL and both Tinybird datasources, prompts for explicit confirmation by default, and switches Postgres cleanup to a direct 10k-chunked DELETE loop (rather than querying IDs from Tinybird) while triggering and optionally waiting for Tinybird delete jobs, persisting job IDs/results to /tmp.

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