chore: parameterize activities cleanup script by platform and type (CM-1298)

Generalize the gerrit one-off cleanup so it can target any platform and any
set of activity types via --platform / --types / --before CLI args. Used to
purge mislabeled gitlab merge_request-closed rows so re-ingestion can recreate
them with the correct type.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Joana Maia <jmaia@contractor.linuxfoundation.org>

Author: joanagmaia

services/apps/script_executor_worker/package.json

@@ -9,6 +9,7 @@
     "dev": "nodemon --watch src --watch ../../libs --ext ts --exec pnpm run start:debug",
     "cleanup-fork-activities": "npx tsx src/bin/cleanup-fork-activities-and-maintainers.ts",
     "cleanup-member-aggregates": "npx tsx src/bin/cleanup-member-aggregates.ts",
+    "cleanup-activities-by-platform-and-type": "npx tsx src/bin/cleanup-activities-by-platform-and-type.ts",
     "recalculate-enrichment-affiliations": "npx tsx src/bin/recalculate-enrichment-affiliations.ts",
     "recalculate-all-affiliations": "npx tsx src/bin/recalculate-all-affiliations.ts",
     "add-lf-projects-to-collection": "npx tsx src/bin/add-lf-projects-to-collection.ts",