* MM-62378: Initialize status and session cache before loading license
ps.LoadLicense could end up calling InvalidateAllCaches. Therefore,
we need to intialize those caches before calling LoadLicense
to prevent a panic from happening.
While here, we also remove some unused code.
https://mattermost.atlassian.net/browse/MM-62378
```release-note
NONE
```
* fix lint errors
```release-note
NONE
```
* fix test
```release-note
NONE
```
We were incorrectly not broadcasting status cache updates
inspite of that being an LRU cache.
We were also not doing it for profilesInChannel cache.
Now we fix it by properly checking the invalidationEvent
which is something local to the cache itself rather
than the cache provider.
https://mattermost.atlassian.net/browse/MM-62077
```release-note
NONE
```
PR: https://github.com/mattermost/mattermost/pull/27204 fixed the issue
where `invalidateWebConnSessionCacheForUser` was not broadcasted across
the cluster. However, we became too conservative and started to invalidate
the session cache as well.
But the session cache only contains the session details for the user
and the team membership. There is no channel membership related info.
Therefore, we avoid that and improve performance as well.
https://mattermost.atlassian.net/browse/MM-60478
```release-note
NONE
```
Co-authored-by: Mattermost Build <build@mattermost.com>
- We introduce 2 new APIs:
1. Scan: this allows incremental iteration
without blocking the Redis server and is the
recommended way to iterate over keys. With this,
we have entirely removed the need for Keys.
2. RemoveMulti: this allows deletion of multiple
keys in a single operation which optimizes
network round trips.
- While here, we make a small improvement to
GetStatusFromCache, where we remove the shallow
copy which wasn't necessary because we always
serialize the data from the cache.
- We do not use Redis for session cache because of
frequent requests to iterate the entire cache which leads
to a lot of `SCAN` calls.
- Avoid broadcasting status update messages for Redis case.
- Setting cache expiry for status cache
- Removing .Set method altogether to prevent
any chances of setting an item with no expiry.
https://mattermost.atlassian.net/browse/MM-59932
```release-note
NONE
```
There were multiple problems with loading of a license.
1. It was called from inside app/server.go and app/platform/service.go. The first one wasn't really needed anymore, so we remove it.
2. To make loading of a license work across a cluster, the license load action was attached along with the `InvalidateAllCachesSkipSend` method. But the problem with that was that it would even get called in the caller node as well, putting it in a recursive loop.
```
LoadLicense -> SaveLicense -> InvalidateAllCaches -> InvalidateAllCachesSkipSend -> LoadLicense
```
To fix this, we create a dedicated loadLicense cluster event and move it away from the `InvalidateAllCachesSkipSend` method. And then from the caller side, we just trigger this action.
3. We also remove the first call to check license expiration which would load the license again. This is unnecessary because if the license is expired, server wouldn't start at all.
While here, we also make some other improvements like removing unnecessary goroutine spawning while publishing websocket events. They are already handled asynchronously, so there is no need
to create a goroutine for that.
We also remove
```
ps.ReloadConfig()
ps.InvalidateAllCaches()
```
from requestTrialLicense as they are already called from inside `*PlatformService.SaveLicense`.
And lastly, we remove the `*model.AppError` return from `*PlatformService.InvalidateAllCaches` because there was nothing to return at all.
https://mattermost.atlassian.net/browse/MM-53879
```release-note
Fix several issues with loading of a license
```
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
```
