ENG-469 Irritating error `transaction type not supported`

[thevops]

Probably since Ethereum allowed to increase validator's balance more than 32 ETH, a weird error started to happen for keep-client.

Logs:

{"level":"fatal","ts":"2025-10-27T13:51:00.102Z","logger":"keep-cmd","caller":"cmd/start.go:41","msg":"error connecting to Ethereum node: [could not create base chain handle: [failed to create Ethereum blockcounter: [failed to get initial block from the chain: [transaction type not supported]]]]"}

It happens on start, causes a fail and the app exits. A workaround is to start the app until it works. It took me 3-10 attempts usually.

Fixes ENG-469