UI issues with farm validator validator box

[esaminu]

Problem The farm validator validator box truncates the validator name if it's too long and does not render the tooltip over the modal when you hover.

Expected Behavior The validator name should be elipsified if it's too long and the tooltip should be visible when you hover.

Initially reported in https://github.com/near/near-wallet/pull/2511#issuecomment-1057573010