[$300] Update challenge forum processor to support self-service flag

[jmgasper]

@atelomycterus - The challenge forum processor needs an update to better handle separate templates for self-service challenges

Expected

For a self-service challenge, we are going to limit the categories and threads available

Implementation

To determine if a challenge is self-service, we should be able to see a new boolean flag on the challenge data:

challenge.legacy.selfService

I'm hoping we can define a new template object in the template.json file for only self-service challenges to use, which will allow us to modify the template as Topcoder requests, thanks.

[atelomycterus]

@jmgasper Please apply PRs:
topcoder-platform/challenge-forum-processor#71
topcoder-platform/forums-groups-plugin#101
topcoder-platform/forums-plugins#111

Example for 'Development Forums':

if selfService is true then a group page for a Development track looks like

Let me know if you have any questions.

Thanks!

[jmgasper]

Challenge https://www.topcoder.com/challenges/8e2cafb8-ff2a-40e4-bd36-a517e8d2cb8e has been created for this ticket.

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[jmgasper]

Challenge https://www.topcoder.com/challenges/8e2cafb8-ff2a-40e4-bd36-a517e8d2cb8e has been assigned to obog.

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[jmgasper]

@atelomycterus - One issue here:

We need a way to change the description separately for self-service as well. We don't want the link to be shown to the client:

                "description": "Welcome to [${ challenge.name }](<%- challenge.url %>) Forum.",

For self-service, we want just:

                "description": "Welcome to ${ challenge.name } Forum.",

[atelomycterus]

@jmgasper Please apply PR-topcoder-platform/challenge-forum-processor#72. Thanks!

[jmgasper]

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