Redirect away from V2 pages when network switches to L2

URL

https://app.uniswap.org/#/pool/v2

Error

Error: No V2 factory address on this chain

Stacktrace

Error: No V2 factory address on this chain
    at sr (https://app.uniswap.org/static/js/main.5691fd30.chunk.js:1:85317)
    at https://app.uniswap.org/static/js/main.5691fd30.chunk.js:1:587638
    at Array.map (<anonymous>)
    at https://app.uniswap.org/static/js/main.5691fd30.chunk.js:1:587599
    at Object.useMemo (https://app.uniswap.org/static/js/4.d35f88da.chunk.js:2:1666864)
    at t.useMemo (https://app.uniswap.org/static/js/4.d35f88da.chunk.js:2:1585104)
    at aT (https://app.uniswap.org/static/js/main.5691fd30.chunk.js:1:587577)
    at no (https://app.uniswap.org/static/js/4.d35f88da.chunk.js:2:1660899)
    at Vu (https://app.uniswap.org/static/js/4.d35f88da.chunk.js:2:1713357)
    at Ss (https://app.uniswap.org/static/js/4.d35f88da.chunk.js:2:1700531)

Device data

{
  "ua": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36",
  "browser": {
    "name": "Chrome",
    "version": "92.0.4515.131",
    "major": "92"
  },
  "engine": {
    "name": "Blink",
    "version": "92.0.4515.131"
  },
  "os": {
    "name": "Windows",
    "version": "10"
  },
  "device": {},
  "cpu": {
    "architecture": "amd64"
  }
}

Start at the /#/pool/v2 URL and reproduce the issue by switching the connected network to an L2. Trace where the “No V2 factory address on this chain” error is surfaced; done means V2 pages redirect away instead of displaying that error when the network changes.