Delete option is not available in WM for some roles when the challenge is not started

[jmgasper]

REF: https://topcoder.atlassian.net/browse/PROD-4328

In this challenge where Registration is not started yet, the below roles cannot be deleted (Ex challenge https://challenges.topcoder-dev.com/projects/23321/challenges/e1538966-b684-4595-9734-a666fffbb198/view created user - jcori)

• Reviewer
• Iterative Reviewer
• Final Reviewer
• Copilot
• Checkpoint Reviewer
• Specification Reviewer

Fix

For the roles above, if the challenge is in New or Draft status, we should allow users with those roles to be deleted, while still following these roles:

• The creator of the challenge can't be deleted
• Copilots can't delete themselves from the challenge