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

.github/workflows/codeql-analysis.yml

@@ -36,6 +36,7 @@ jobs:
     
     - name: Build
       run: |
+        cd server
         make setup-go-work
         make build-linux-amd64