v8.0 module release (#22975)

https://mattermost.atlassian.net/browse/MM-52079

```release-note
We upgrade the module version to 8.0. The new module path is github.com/mattermost-server/server/v8.
```


Co-authored-by: Doug Lauder <wiggin77@warpmail.net>

server/model/post_info.go

@@ -0,0 +1,15 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+type PostInfo struct {
+	ChannelId          string      `json:"channel_id"`
+	ChannelType        ChannelType `json:"channel_type"`
+	ChannelDisplayName string      `json:"channel_display_name"`
+	HasJoinedChannel   bool        `json:"has_joined_channel"`
+	TeamId             string      `json:"team_id"`
+	TeamType           string      `json:"team_type"`
+	TeamDisplayName    string      `json:"team_display_name"`
+	HasJoinedTeam      bool        `json:"has_joined_team"`
+}