Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/templates/partials/sender_info_col.mjml

@@ -0,0 +1,30 @@
+<mj-column css-class="senderInfoCol" width=90% >
+    <mj-raw>
+        <tr>
+            <td>
+                <div class="postNameAndTime">
+                    <div class="senderName">{{.SenderName}}</div>
+                    {{if .Time}}
+                    <div class="time">{{.Time}}</div>
+                    {{end}}
+                    {{if .ChannelName}}
+                    <div class="channelBg">
+                        {{if .ShowChannelIcon}}
+                        <div class="channelLogo"><img src="{{$.Props.SiteURL}}/static/images/channel_icon.png" width=10px height=10px></img></div>
+                        {{end}}
+                        <div class="channelName">
+                            {{if .OtherChannelMembersCount}}
+                            <span class="gmChannelCount">{{.OtherChannelMembersCount}}</span>
+                            {{end}}
+                            {{.ChannelName}}
+                        </div>
+                    </div>
+                    {{end}}
+                </div>
+            </td>
+        </tr>
+    </mj-raw>
+    <mj-text css-class="senderMessage" padding="0px">
+        {{.Message}}
+    </mj-text>
+</mj-column>