* Adds logical deletes to shared channel remotes and remote clusters
Instead of physically deleting the shared channel remote and remote
clusters records when a channel is unshared, a remote uninvited or a
remote cluster is deleted, now those have a logical `DeleteAt` field
that is set.
This allows us to safely restore shared channels between two remote
clusters (as of now resetting the cursor without backfilling their
contents) and to know which connections were established in the past
and now are severed.
* Delete the index in remoteclusters before adding the new column
* Fix bad error check
* Adds default team to the remote cluster entity
A new DefaultTeamId field is added to the RemoteCluster entity and its
endpoints, and used when receiving channel invites to choose in which
team to create a new channel.
This will be later extended with the ability for the system admin to
manually accept invites, choosing which team to create the channel on
each. This use case will be triggered when the DefaultTeamId field is
empty, which now simply chooses the first team it finds in the
database as a fallback.
* Fix migrations list
* Fixes channelinvite test case
* Fix i18n
* Fix migration list
* check user visibility when accepting channel invites for DMs
* stronger visibility checking for DM users
* check for correct remoteid for remote user in DM invite
* fix unit test
---------
Co-authored-by: Mattermost Build <build@mattermost.com>
It was a good decision in hindsight to keep the public module as 0.x
because this would have been a breaking change again.
https://mattermost.atlassian.net/browse/MM-53032
```release-note
Changed the Go module path from github.com/mattermost/mattermost-server/server/v8 to github.com/mattermost/mattermost/server/v8.
For the public facing module, it's path is also changed from github.com/mattermost/mattermost-server/server/public to github.com/mattermost/mattermost/server/public
```
