Mattermost-server: [Help Wanted] [MM-9602] Move getFlaggedPosts action from webapp to mattermost-redux

[jasonblais]

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Notes: Jira ticket

The webapp has an implementation of the getFlaggedPosts action here: https://github.com/mattermost/mattermost-webapp/blob/master/actions/views/rhs.js#L127

This action belongs in mattermost-redux so it can be shared between multiple apps.

A few things should be done:

• Create a new action in actions/posts.js of the mattermost-redux repository
• Make the action follow the same pattern as other mattermost-redux actions
• Add a unit test for this action in test/actions/posts.js
• Submit a PR with these updates to mattermost-redux
• Once merged, update the webapp to use the new mattermost-redux action

Speak to @joram on pre-release (@jwilander on GitHub) for help if needed

[lisakycho]

I'll take this one!

[fraziern]

I can take a look.