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fix(submission): retain username in `_submitted_by` after submitting user has been deleted DEV-1211 (#6430)

### 📣 Summary
Ensure that submissions remain attributed to their original submitter
even if the user account is deleted, and that the `_submitted_by` value
continues to persist correctly during edits and bulk updates.

### 📖 Description
Previously, deleting a user caused all their submissions to lose the
`_submitted_by` reference or even be deleted, depending on ownership.
This PR ensures that:
- Submissions made by a deleted user on non-owned projects are retained.
- The `_submitted_by` field correctly persists the username of the
deleted user.
- Editing or bulk-updating those submissions does not remove or
overwrite the existing `_submitted_by` value.
- Bulk and single validation status updates correctly reference the
original `_submitted_by` username.

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