Custom status feature (#16835)

* Create the system console setting and send to webapp

* MI-1145: Add custom status APIs

* MI-1145 Add slash commands to set and clear status

* Add validation for custom status API

* Trim custom status message

* Code refactoring

- Run gofmt

- Rename constants

* Remove sendUserUpdated webhook event

* Fix recent custom status length

* Update error conditions

* Disable /status slash command when config setting is off

* MI-1155: Create the feature flag for custom status APIs and slash commands

* Move recent custom statuses to user preferences (#7)

* Move recent custom statuses to user preferences

* Code refactoring and feedback changes

* Update slash command text and emoji regex

* Make the custom status feature flag off by default

* Update SetCustomStatus, handle recents not set better

* Update status codes

* Update slash command handling

* Add telementry settings

* Fix i18n order

* Revert "Fix i18n order"

This reverts commit 499f7eaca8180336f5bcca360cc0133365899e08.

* Update i18n strings

config/client.go

@@ -16,6 +16,7 @@ func GenerateClientConfig(c *model.Config, telemetryID string, license *model.Li
 	props := GenerateLimitedClientConfig(c, telemetryID, license)
 
 	props["SiteURL"] = strings.TrimRight(*c.ServiceSettings.SiteURL, "/")
+	props["EnableCustomUserStatuses"] = strconv.FormatBool(c.FeatureFlags.CustomUserStatuses && *c.TeamSettings.EnableCustomUserStatuses)
 	props["EnableUserDeactivation"] = strconv.FormatBool(*c.TeamSettings.EnableUserDeactivation)
 	props["RestrictDirectMessage"] = *c.TeamSettings.RestrictDirectMessage
 	props["EnableXToLeaveChannelsFromLHS"] = strconv.FormatBool(*c.TeamSettings.EnableXToLeaveChannelsFromLHS)