[$50] Misc fixes on the challenge/resource APIs

[ThomasKranitsas]

• Update PUT/PATCH /challenges/:uuid to extend phases instead of replacing them
• Update POST /resources to skip phase dependency checks on tasks

cc @rootelement

[ThomasKranitsas]

Fixed in:

• 011c08c
• topcoder-platform/resources-api@c76eb6d

[rootelement]

Contest https://www.topcoder.com/challenges/30143628 has been created for this ticket.

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[rootelement]

Contest https://www.topcoder.com/challenges/30143628 has been updated - it has been assigned to thomaskranitsas.

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[rootelement]

Payment task has been updated: https://software.topcoder.com/review/actions/ViewProjectDetails?pid=30143628

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