Server status - submission file size added

@ mention of reviewers`

@Didayolo`

A brief description of the purpose of the changes contained in this PR.

Now In server status page, submission size is displayed

Issues this PR resolves

• #744 (closed) -> Submission size

Checklist

• Code review by me
• Hand tested by me
• I'm proud of my work
• Code review by reviewer
• Hand tested by reviewer
• CircleCi tests are passing
• Ready to merge