[$450] Email message tweak for MFE

[jmgasper]

@atelomycterus - When the user receives a notification email for a self-service challenge where they are the Client Manager, we're going to want the URL to respond to the message to point to something other than the main Vanilla site:

So, in dev, instead of vanilla.topcoder-dev.com, we're going to want to use platform.topcoder-dev.com/self-service/work-item/{challenge ID}

Is that possible? This would only be for the emails sent to the Client Manager. All other email notifications for members, copilots, etc... would point to the main forum site still.

[jmgasper]

Challenge https://www.topcoder.com/challenges/835b393c-90e3-4ccd-8fc8-30d03fa384ea has been created for this ticket.

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[jmgasper]

Challenge https://www.topcoder.com/challenges/835b393c-90e3-4ccd-8fc8-30d03fa384ea has been assigned to obog.

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[atelomycterus]

@jmgasper Please apply PRs:
#666
topcoder-platform/forums-plugins#112
topcoder-platform/forums-groups-plugin#102

Please set the embed url before testing:

Example:
The email button link ("Open Discussion") will navigate to http://embed.vanilla.localhost:8000/self-service/work-items/0f6c33ff-564b-44d1-af79-723467b77028 for users with `Client Manager' role.

Notes: The embed url will be reset after re-deploying. If you want to keep it in the default config, we can manage with env parameter configured for each environment separately like DB_HOST, etc.

Need to add the line with env param name:

$Configuration['Garden']['Embed']['RemoteUrl'] = getenv('my_embed_url_param_name');

Let me know the name of env parameter and I'll update the config file.

[jmgasper]

@atelomycterus - One tweak here, can we also add ?tab=messaging to the end of the URL sent in the email please? That'll redirect the user to the exact tab we need.

[atelomycterus]

@jmgasper Please apply PR-topcoder-platform/forums-groups-plugin#103. Thanks!