MM-8853: Adding MANAGE_EMOJIS and MANAGE_OTHERS_EMOJIS permissions (#8860)

* MM-8853: Adding MANAGE_EMOJIS and MANAGE_OTHERS_EMOJIS permissions

* MM-8853: Removing unnecesary emoji enterprise feature

* Create emojis migration

* Adding MANAGE_EMOJIS and MANAGE_OTHERS_EMOJIS always to system admins

* Simplifing permissions checks

* Revert "Simplifing permissions checks"

This reverts commit e2cafc1905fc9e20125dd9a1552d2d0c7340ae59.

web/web_test.go

@@ -61,6 +61,7 @@ func Setup() *TestHelper {
 	ApiClient = model.NewAPIv4Client(URL)
 
 	a.DoAdvancedPermissionsMigration()
+	a.DoEmojisPermissionsMigration()
 
 	a.Srv.Store.MarkSystemRanUnitTests()