feat(massEmail): query for identifying inactive users based on login, form activity, and submissions TASK-1581

[rajpatel24]

🗒️ Checklist

1. run linter locally
2. update all related docs (API, README, inline, etc.), if any
3. draft PR with a title <type>(<scope>)<!>: <title> TASK-1234
4. tag PR: at least frontend or backend unless it's global
5. fill in the template below and delete template comments
6. review thyself: read the diff and repro the preview as written
7. open PR & confirm that CI passes
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9. delete this section before merging

📣 Summary

Detect and return a list of users who have been inactive for a specified period based on login activity, project updates, and submissions.

📖 Description

This update introduces a method to identify inactive users who have not:

• Logged into their account.
• Modified their projects or had modifications made by others.
• Received submissions to their projects.

By default, the inactivity period is set to 365 days but can be configured dynamically.

👀 Preview steps

1. Run get_inactive_users(days=1) in the shell, users inactive for 1+ days should be listed.
2. Modify inactivity_threshold = now() - timedelta(minutes=2)
3. Log in & log out, run get_inactive_users(), user should NOT be listed. Wait 2 mins, run again, user should be listed now.
4. Log in, create a project, run get_inactive_users(), user should NOT be listed. Wait 2 mins, run again, user should be listed now.
5. Add a submission, run get_inactive_users(), user should NOT be listed. Wait 2 mins, run again, user should be listed.