feat: add alerts in data-gouv export

[MaGOs92]

No description provided.

[Copilot]

Pull request overview

This PR extends the weekly Data.gouv CSV export to include alert (“alertes”) counts per commune alongside existing signalement counts, and updates the task test accordingly.

Changes:

• Add AlertService.getAlertCountsByCommune() to compute alert status totals grouped by commune.
• Update TaskService.weeklyDataGouvCSVExport() to merge signalement + alert counts per commune and export the expanded CSV schema.
• Extend the Task module test to create alerts and assert the new CSV columns/rows (including communes that only appear via alerts).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/tests/task.spec.ts	Updates the weekly Data.gouv export test to seed alerts and validate the new alert count columns and an additional commune row.
src/modules/task/task.service.ts	Merges signalement + alert counts per commune, updates CSV header/rows, and sorts by combined totals before upload.
src/modules/task/task.module.ts	Imports AlertModule so TaskService can inject AlertService.
src/modules/alert/alert.service.ts	Adds a query-based aggregation method to return alert counts by commune and status.

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