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.

i18n/en.json

@@ -1336,10 +1336,6 @@
     "id": "api.emoji.delete.delete_reactions.app_error",
     "translation": "Unable to delete reactions when deleting emoji with emoji name %v"
   },
-  {
-    "id": "api.emoji.delete.permissions.app_error",
-    "translation": "Invalid permissions to delete emoji."
-  },
   {
     "id": "api.emoji.disabled.app_error",
     "translation": "Custom emoji have been disabled by the system admin."