* Initial Implementation of Push Proxy Authentication
* Include Config Listener for Leader plus delete startup function as job scheduler runs on initialization
* Remove push proxy auth from local imports
* Add push proxy auth to external imports
* Add push proxy auth error messages
* Update error codes
* Fix enterprise dep definition
* make i18n-extract
* Mock System store Get
* m
* m
* m
* m
* Update serverID header
* Add install type env var to docker
* Update Push Proxy config with new options
Global, US, Germany and Japan. Previous configurations will keep working
* use model.SafeDereference
* Delete token when new push proxy URL is empty
* ServerID header only if auth token is available
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Co-authored-by: Daniel Schalla <daniel@mattermost.com>
Co-authored-by: Nick Misasi <nick.misasi@mattermost.com>
Co-authored-by: Mattermost Build <build@mattermost.com>
