Show submission time in local time zone

[ihsaan-ullah]

@ mention of reviewers

@Didayolo

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

submissions panel and leaderboard now show submission time in local time zone

Submission panel shows time in local time zone

Leaderboard shows time in local time zone

Issues this PR resolves

• 1359

Checklist

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

[Didayolo]

The date of submission shown is alwayw "2024-10-13 13:00".

On submission_time branch:`

On develop branch:

@ihsaan-ullah The problem comes from this function:

        self.pretty_date = function (date_string) {
            date_string = "2024-10-13T11:00:00Z"
            if (!!date_string) {
                return luxon.DateTime.fromISO(date_string).toFormat('yyyy-MM-dd HH:mm')
            } else {
                return ''
            }
        }