Removed joint_permissions auto_increment id

Removed auto_incrementing id and set a primary key of the [role_id,
entity_type, entity_id, action] instead since this table could recieve a
lot of activity, especially when permission regeneration was automated,
leading to very high auto_increment counts which could max out the
integer limit.

Also updated some RolesTest comment endpoints to align with
recent route changes.

Should fix #2091

app/Auth/Permissions/JointPermission.php

@@ -3,25 +3,26 @@
 use BookStack\Auth\Role;
 use BookStack\Entities\Entity;
 use BookStack\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\MorphOne;
 
 class JointPermission extends Model
 {
+    protected $primaryKey = null;
     public $timestamps = false;
 
     /**
      * Get the role that this points to.
-     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
      */
-    public function role()
+    public function role(): BelongsTo
     {
         return $this->belongsTo(Role::class);
     }
 
     /**
      * Get the entity this points to.
-     * @return \Illuminate\Database\Eloquent\Relations\MorphOne
      */
-    public function entity()
+    public function entity(): MorphOne
     {
         return $this->morphOne(Entity::class, 'entity');
     }