polygon: switch to native usdc on polygon

[buck54321]

Circle now issues USDC on Polygon on a native contract instead of using a bridge. They are recommending that everyone switch to the native token. Coinbase already only supports withdraws of the native token.

Devs: If you have bridged USDC in your mainnet walletpair or getgas/deploy wallets, you'll need to be on a commit before this one, and send it to yourself. I know of a couple of methods.

1. Send it to coinbase, which still accepts deposits of both tokens, and then withdraw, which will be the native token.
2. You could also send it to e.g. MetaMask and use Uniswap to convert from USDC.e to USDC, then send it back.

Closes #2559

[ukane-philemon]

UnAck. Token address and swap contract txs ids match but I don't have testnet usdc to test rn.