Finding related submissions doesn't work for supplementary files

[kam193]

Describe the bug
If trying to find submissions related to a supplementary file, no submission is found. It looks like it's not really a problem in a normal flow (the only use case I find is to look for other submissions with the same supp. file, probably a rare case), but it's more painful in malware archive, which operates on files, not submissions - and thus, it's very useful to understand where a file comes from.

To Reproduce
Steps to reproduce the behavior:

1. Open a submission with some results.
2. Click on results details, and open the preview of any supplementary file (e.g. even ontology).
3. Click on "Related submissions" button.
4. Observe no submission found

OR

1. Generate an archived submission with some supplementary files.
2. Go to the archive, click on any supplementary file (again, even an ontology file).
3. Click on "Related submissions" button.
4. Observe no results.

Expected behavior
Related submissions are found.

Screenshots

Environment (please complete the following information if pertinent):

• Assemblyline Version: 4.5.0stable4
• Browser:Firefox

[cccs-rs]

This can be due to the fact that looking for "Related Submissions" will point you to the Submission index and supplementary files aren't included in the files field of a Submission, only files that seem to have been submitted.

Perhaps this could be amended to include supplementary files as well upon submission completion?