[$30] Add `copilot` column to project table

[jmgasper]

We want to add a copilot column to the project table, for both normal users and admins. For admins, we currently show the owner, but we should show the copilot column separately as well. Normal users should also see the copilot column.

If no copilot is set, we'll just show it as blank.

[jmgasper]

Contest https://www.topcoder.com/challenges/30134391 has been created for this ticket.

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[jmgasper]

Contest https://www.topcoder.com/challenges/30134391 has been updated - it has been assigned to afrisalyp.

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[jmgasper]

Payment task has been updated: https://software.topcoder.com/review/actions/ViewProjectDetails?pid=30134391

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