Use cell alias for all cells in a vitess cluster instead of querying vitess

[Phanatic]

PlanetScale databases have a cell alias that is universal across the vitess clusters we create, we can use this instead of querying for the vitess tablets.

GetCellsAliases

{
  "planetscale_operator_default": {
    "cells": [
      "aws_useast2a_2",
      "aws_useast2b_2",
      "aws_useast2c_2"
    ]
  }
}