Project and ProjectLocale Insights pages don't have all data since January

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The missing data (e.g. ProjectLocaleInsightsSnapshot.human_translations) was last collected on January 23. Later that day we deployed stats refactor, which also touched the pontoon.insights module.

Since then, ProjectLocaleInsightsSnapshot data is partially missing.

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This looks like the culprit (line 337 in pontoon/insights/tasks.py): https://github.com/mozilla/pontoon/commit/948e6cf02b1e58e60ddd599c8e40c27a3f432fdc#diff-2df1eab89afb639511fdb958186ff9e4b628de46aa6060ff3413c651f88b230dL337-R350

-        activities, locale=project_locale.locale.id, project=project_locale.project.id
+        activities, locale=project_locale.locale, project=project_locale.project