Fixing issues with github icon disappearing on disconnect

[avasconcelos114]

Summary

This PR fixes an issue with the configuration state that would cause certain components to run into errors at runtime (due to the default state of configuration being true instead of the actual object that is received by API responses). As well as fixing the main issue with the configuration being overwritten to undefined when the RECEIVED_CONNECTED action is dispatched in various parts of the webapp via the checkAndHandleNotConnected function.

Ticket Link

Fixes https://mattermost.atlassian.net/browse/MM-66428
Fixes #939

QA Steps

1. Install GitHub plugin on a fresh Mattermost instance
2. Have a Mattermost user that is a member of at least 2 teams
3. Click the icon on the sidebar to connect to a GitHub account
4. Run the /github disconnect command to disconnect accounts
5. Verify that the icon on the sidebar either disappeared, or remains available to reconnect the account

[nevyangelova]

LGTM

[mm-cloud-bot]

Test server destroyed

[mm-cloud-bot]

Plugin Spinwick PR #956 🎉

Test server created!

Access here: https://github-pr-956-jy34u.test.mattermost.cloud

Plugin	Version	Artifact
github	1052330	Download

⚠️ Plugin Installation Issue

The test server was created successfully, but there was an issue installing or enabling the plugin automatically:

• Install Error: failed to wait for S3 artifact: timed out waiting for S3 artifact

You can manually install the plugin:

1. Download the plugin artifact from the link above
2. Upload it to your test server at yec9eaka7fno5rfqjj5fe5oy8r
3. Enable it in System Console > Plugins

Future commits will still attempt to automatically update the plugin.

Installation ID: yec9eaka7fno5rfqjj5fe5oy8r
Logs: Click here

Credentials: Posted securely in this Mattermost channel - Look for PR #956

[ogi-m]

LGTM!