[web] Add ENSAvatar to ConnectedWalletInfo if set

Summary:
This brings us to full parity with the RainbowKit ConnectButton component.

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Depends on D6636

Test Plan:
Looks as expected:

(when address set to vitalik.eth)

Continues looking as expected for addresses where ENS avatar isn't set:

Reviewers: ashoat, tomek, rohan, ginsu

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D6637