PLT-8244 Prevented web app from loading before storage is loaded

[hmhealey]

Because previously storage wasn't always loaded when the app started it would cause two things:

1. The post draft for the current channel wouldn't usually be loaded
2. The previous team/channel wouldn't be loaded if you didn't explicitly navigate to them

This prevents the app from loading until the storage is loaded. Ideally, we would lock the individual parts, but because the routing code controls the current team/channel, we needed to prevent even that from running.

Ticket Link

https://mattermost.atlassian.net/browse/PLT-8244

Checklist

• Added or updated unit tests (required for all new features)
• Touches critical sections of the codebase (auth, posting, etc.)

[hmhealey]

@jespino It might be helpful if you looked over this, if you have a chance

[enahum]

Right, we do this in RN and it makes total sense...

FYI: build is failing

[jespino]

I going to try it in my computer, and check a pair os things (the localForage generated keys, the sync between tabs, etcetera).

[jespino]

Looks like everything is working as expected in the storage part (I was concerned about the store/restore/sync-between-tabs processes, but looks like everything is working fine) :)